Blue Terror Sideboard Guide

Introduction

Blue Terror is one of Pauper's most-played decks, at 10.5% of the field. The plan is easy to state and hard to disrupt: chain one-mana draw spells to fill the graveyard, land Tolarian Terror or Cryptic Serpent as a 5/5 or 6/5 for one or two mana, and defend it with Counterspell until it has attacked for twenty.

Its position in the metagame is well defined. The deck preys on opponents who fight on the stack or from the hand: it is favored against Mono Red Madness, the most-played deck in the format, where cheap counters and a 5-toughness threat line up cleanly against burn, and it is favored against Ruby Storm and Familiars, where the counter suite attacks the engine directly. Bogles is one of its best matchups. The hard games come from decks that flood the board with cheap creatures or grind through one threat at a time: Elves, Jund Wildfire, and Mono Red Rally are unfavored, Grixis Affinity is slightly unfavored, and against the rest of the top tier, such as Dimir Faeries and Monster Tron, expect close, slightly uphill games.

It is also a joy to pilot: every turn is a stream of small decisions about what to keep on top, what to counter, and when to commit, and few plays in the format feel better than untapping behind a one-mana 5/5 with Counterspell open.

General Strategy

Blue Terror plays one giant creature and protects it. Everything else in the deck exists to make that creature nearly free: Thought Scour, Mental Note, Brainstorm, and Ponder each cost one mana, replace themselves, and land in the graveyard as an instant or sorcery themselves, while Thought Scour and Mental Note mill two more cards on top of that, and Tolarian Terror and Cryptic Serpent cost one less for each of those cards. The most important thing you do each game is sequence the draw spells so that around turn three a 5/5 or 6/5 hits the battlefield for one or two mana, often with Counterspell mana still open behind it. The opponent then has to fight through counters to answer a threat that cost you almost nothing while it kills them in four attacks. That mana gap is the whole deck.

The engine runs on volume. Thought Scour and Mental Note are the best fuel because each one moves three cards to the graveyard at once - the two it mills plus the spell itself - and more than half the deck is instants and sorceries, so most of what they touch grows the discount. Brainstorm and Ponder fill the gaps, finding lands, threats, and counters while adding themselves to the pile. An uncontested start looks like this: Island and Delver of Secrets on turn one. On turn two the upkeep reveal shows an instant or sorcery and it flips; you play a second Island, cast Thought Scour, and attack for 3. On turn three Mental Note and Ponder both resolve on the same two lands and the flier attacks again. That is 6 damage dealt, and between the three spells cast and the four cards milled, the graveyard usually holds enough instants and sorceries that the Tolarian Terror in hand now costs one or two mana.

All three win conditions close through combat: Tolarian Terror and Cryptic Serpent on the ground, a flipped Delver of Secrets in the air. When the first threat is answered, redundancy is the backup plan: eight serpents means the next one arrives with counter protection while Lórien Revealed and Deep Analysis refuel the hand in between. Against a board too wide to attack through, Sleep of the Dead taps the best blocker and escapes from the graveyard to do it again. Against a resolved permanent the counters missed, Deem Inferior sends it back into its owner's library.

Two pressure points shape every game. The first is the graveyard: the serpent discount, escape, and flashback all run through it, so an opponent who exiles it puts Tolarian Terror back toward seven mana and sets you back several turns - the response is to keep casting draw spells and rebuild rather than treating a stocked graveyard as permanent. The second is that the deck presents exactly one creature at a time, so an effect that forces you to sacrifice a creature answers a serpent at full value, since nothing is targeted and the ward tax never applies. Holding a second serpent and a counter is the insurance.

The Cards

Tolarian Terror

The deck's namesake and the card every other spell serves. It is a seven-mana 5/5 on paper, but each instant and sorcery in your graveyard shaves a mana off, and it bottoms out at a single blue mana. Ward makes an opponent pay two extra mana whenever they target it, which turns cheap removal into a losing trade and protects it on the turns you cannot hold up a counter. Five toughness walls most early boards; five power kills in exactly four attacks. It is the wall you stabilize behind and the clock you win with.

Cryptic Serpent

The other half of the eight-serpent core, with the same discount attached. It hits for 6 instead of 5 but has no ward, so it is the serpent removal will chase and the one you most want to deploy with counter backup. The discount only touches the generic part of its cost, so it never drops below two mana, where Tolarian Terror bottoms out at one - when your hand holds both, lead with the Terror.

Delver of Secrets

The fast start. A turn-one Delver of Secrets flips into a 3/2 flier as soon as an upkeep reveal shows an instant or sorcery, and with thirty-two of them in the deck the blind flip is better than a coin flip - with Ponder or Brainstorm setting the top, it is close to on demand. Flipped, it is the deck's only evasive threat, which matters because the serpents win on the ground. Even when it trades with a removal spell, it spent the opponent's card and mana while your engine set up.

Thought Scour

The best engine card. One mana at instant speed puts three cards in your graveyard at once - the two it mills plus the spell itself - and replaces itself. Cast it at the end of the opponent's turn when nothing better is happening, or on your own turn immediately before a serpent to shave the cost at the last moment. Only Mental Note moves the discount as fast.

Role Assignment

Blue Terror is an aggro-control deck, and every matchup is fought on the same few axes. First, the stack: whether key spells - theirs and yours - can be forced past cheap counters decides the middle turns. Second, the setup window: the deck barely touches the board on its first two turns, so anything the opponent deploys then is nearly free. Third, removal alignment: damage-based spells rarely kill a 5-toughness serpent, targeted answers pay the ward tax on Tolarian Terror, but a forced sacrifice ignores both and answers your lone creature at full value. Fourth, the graveyard: an opponent who exiles it delays the serpents by turns. Fifth, staying power: once both hands empty, your draw spells and counters are measured against whatever engine they kept. Left alone, the deck kills around turn six - fast enough to be the beatdown against slow decks, slow enough that true aggro outraces it.

Vs. Aggro. You are the control. Their start beats your turn-six clock and your first two turns concede the board, so stabilizing matters more than racing. A 5-toughness serpent walls most of their creatures, counters go to the spells that break the wall - a pump effect, burn pointed at your face - and Force Spike is at its best against opponents who tap out every turn. The role flips only once the board is locked. The demonstrative play: block with Tolarian Terror for a turn or two, and start attacking only when the race math is safely yours.

Vs. Midrange. Usually the beatdown, because the deck is tempo-positive and their one-for-one answers line up terribly against a discounted serpent: you spend one or two mana on the threat and one or two more protecting it, and every exchange leaves you mana ahead. Their edge is card advantage over a long game, and your inevitability is only medium, so do not drift into a pure attrition plan - land a protected serpent, counter their value engines, and close in four attacks before their grind takes over. The demonstrative play: hold a castable serpent one extra turn so it arrives alongside Counterspell. Patience in service of aggression.

Vs. Control. The beatdown, unambiguously. Your threats cost less than their answers, eight maindeck counters win the fights over the stack, and because you usually present one serpent at a time, a sweeper rarely catches more than one card. Medium inevitability means the very long game can still slip away to a deck built for it, so use the low curve: a turn-one Delver of Secrets is at its best here, forcing them to spend answers while you bank counters. The demonstrative play: resolve a one-mana serpent with two counters held open, then never tap out again.

Play Patterns

Cast your draw spells before your discounted spells in the same turn. Tolarian Terror and Cryptic Serpent count the graveyard, and Deem Inferior counts cards drawn this turn, at the moment you cast them. A Thought Scour that resolves first adds itself plus two milled cards and can shave one to three mana off the spell that follows; the reverse order pays full price for nothing.
Pair a selection spell with a mill spell in the same turn, selection first. Ponder draws after you reorder, so the two cards you passed on stay on top, and Brainstorm puts two back the same way; a Thought Scour or Mental Note cast behind either one buries exactly those cards as serpent fuel and buys a fresh look instead. Fired blind, the same mill is as likely to bury the Tolarian Terror you are digging for. Split the pair across two turns and your draw step takes the top card back, so on a single land lead with the mill spell, which loses nothing by waiting - unless you need Ponder's shuffle to find a second land.
Hold a castable serpent until you can deploy it with counter mana open. Waiting is nearly free, because every spell you cast in the meantime makes it cheaper, and the difference between a protected 5/5 and a naked one is usually the game. A Tolarian Terror that resolves alongside an untapped Counterspell or Force Spike demands two answers in one window. When you are dying, the wall comes down early; when you are not, patience costs nothing.
Pay Sleep of the Dead's escape with milled lands and creatures, not instants and sorceries. Sleep of the Dead escapes by exiling three other cards of your choice from your graveyard, and every instant or sorcery that leaves raises your next serpent's cost by one. The mills put Islands, extra copies of Delver of Secrets, and spare serpents in the graveyard - spend those, they are free currency. The same logic times : flash it back after your threats are deployed, since casting it from the graveyard removes a sorcery the serpents were counting.

Black Sacrifice

Carrion Feeder - emblematic card for this matchup

Matchup - Unfavored

Black Sacrifice is the aggressor, and we cannot race it. Their curve of one-mana creatures builds a wide board while our opening turns go to draw spells, so despite being the tempo deck in most pairings, we take the control seat here: contain the growth payoffs, stabilize behind a serpent their one-power swarm cannot attack through, and win the longer game their engine cannot. The exchange rates are why this is unfavored - their creatures die into tokens and counters, so answers spent on fodder trade down, while Snuff Out and Accursed Marauder answer a lone serpent and Rite of Consumption ends a race from a life total that looks safe on board. Our Counterspell, Force Spike, and Deem Inferior have to break Carrion Feeder and Mortician Beetle long enough for a serpent to wall the ground. They have to finish us before our card quality takes over; every clean answer on a growth payoff narrows their window.

Counter discipline decides the opening turns. Force Spike is at its best while they are still tapped out, stopping a Carrion Feeder or Mortician Beetle outright, and the die roll matters here: on their play a second wave of creatures lands before we have a blocker, while on ours that tapped-out window is the main prize. Hold Counterspell for Accursed Marauder, Rite of Consumption, and Sadistic Glee - trading it for one-mana fodder is the losing exchange this matchup tempts us into, since they deploy two threats for each counter and the spells that actually beat us then resolve unopposed. Deploy the first serpent with a spare creature down or counter mana open. A Delver of Secrets on the battlefield means Accursed Marauder's forced sacrifice takes a 1/1 instead of the serpent.

Once a serpent lands, hold it back as a blocker while the cantrips refuel us, and start attacking only when our life total still clears a Rite of Consumption drain equal to their biggest creature's power. Aim Deem Inferior at the payoff that already grew: it puts the creature into their library without a death, so the counters are gone for good and it leaves behind no tokens, no Unearth target, and no Sadistic Glee growth - cast a draw spell first in the same turn to cheapen it. Expect the ground to clog with Squirrel and Insect tokens chump-blocking the serpents. When that happens, a flipped Delver of Secrets is often the real clock, because only Infestation Sage's Insect token can block it.

Key Threats

Carrion Feeder is the card the matchup bends around. It can't block, so it never slows our serpents; the danger is that every sacrifice grows the attacker Rite of Consumption later converts into a drain. As a free sacrifice outlet it also lets them dodge our targeted spells: point Deem Inferior at any other creature while it is on the battlefield and they eat the target in response - our card does nothing, the death still pays them anyway, and the outlet banks another counter. Answer Carrion Feeder itself, with Force Spike on the stack early or Deem Inferior once it has grown.

Accursed Marauder is their cleanest answer to our plan. The forced sacrifice ignores both targeting and Tolarian Terror's ward, and since we usually present exactly one creature, a two-mana creature removes the serpent - while their own half cashes in a death trigger they wanted anyway. Every copy they draw stays live for as long as we keep exactly one creature on the battlefield, so tapping out for a lone serpent is the mistake it punishes. This card is the reason the serpent waits for Counterspell mana or a Delver of Secrets already in play.

Rite of Consumption steals games we have already stabilized. They attack, then sacrifice their biggest creature in the second main phase to drain us for its power, so a close race ends from a life total that looks safe on board - and the life they gain swings the race back the other way at the same time. It is a sorcery, so Counterspell and Force Spike can catch it, and because the sacrifice is an additional cost paid on casting, they lose the creature even when we counter it.

Mortician Beetle demands an answer even while it looks idle. Unlike Carrion Feeder it blocks, and every sacrifice on their side - a Village Rites, a Carrion Feeder activation, a Rite of Consumption - grows it without costing them any extra mana. Left alive through their sacrifice turns, it becomes the one ground creature that walls Tolarian Terror while still attacking. Catch it with Force Spike in the opening turns or pull it off the board with Deem Inferior once the counters pile up.

Sideboard Plan

In:

3 Gut Shot
2 Dispel
2 Envelop
2 Annul

Out:

2 Sleep of the Dead
2 Force Spike
2 Ponder
1 Deep Analysis
2 Cryptic Serpent

Gut Shot comes in as three effectively free removal spells. Every creature in their mainboard has one toughness, so a spell paid with two life kills Carrion Feeder, Mortician Beetle, or Bloodthrone Vampire on sight, before a single sacrifice grows it - all while our counter mana stays open.

Dispel comes in because their suite is instant-heavy: Village Rites, Supernatural Stamina, Snuff Out, and post-board Tragic Slip. One mana to stop the draw spell that refuels them or the removal aimed at a serpent is our most efficient interaction in the pairing.

Envelop counters Rite of Consumption, the drain that steals races. The sacrifice is an additional cost paid on casting, so they lose the creature and get nothing for it, and the same copy answers an Unearth rebuy.

Annul is the clean counter for Sadistic Glee, the aura that turns their chump deaths into a growing attacker, and it covers Nihil Spellbomb after boarding. Two copies is the ceiling: those are the only artifact and enchantment targets we expect to see, and extra copies rot against their creature draws.

Sleep of the Dead goes out. Tapping one creature buys little against a wide, expendable board that chump-blocks with Squirrel and Insect tokens and rebuilds every turn, and each escape recast exiles three graveyard cards our serpent discounts want.

Force Spike is trimmed, not cut. It is live only against their tapped-out opening turns, where it stops a Carrion Feeder or Accursed Marauder outright; from the mid-game their spare lands always cover the tax, so two copies keep the early hit without flooding the late game.

Two copies of Ponder come out because a sorcery-speed cantrip is the one we can least afford while holding Gut Shot and counters against a deck that operates at instant speed, and unlike Thought Scour and Mental Note it adds only itself to the graveyard. Keeping one preserves enough cantrip density to price the serpents.

Deep Analysis leaves because a four-mana sorcery-speed tap-out is exactly the window Accursed Marauder and Rite of Consumption want to resolve in, and after boarding their Nihil Spellbomb and Rotten Reunion exile the flashback half.

Cryptic Serpent gives up two copies because it lacks ward: it is the serpent Snuff Out kills at the cost of four life and Tragic Slip kills for one mana, while Tolarian Terror taxes both of those answers with its ward. Two copies stay because the long game still needs threat density once their edicts are spent.

Sideboarding leaves the pairing about where it started. Their menu against us is deeper - graveyard hate, Mesmeric Fiend, and removal upgrades - but Gut Shot into a mainboard where every creature has one toughness is the single most impactful bring-in either side has, so the exchange balances and the games stay close.

Post-board Strategy

Gut Shot is the headline change: the payoffs we could only catch on the stack in game one can now be killed after they resolve. The discipline is to shoot the payoff itself - Carrion Feeder, Mortician Beetle, or whatever wears Sadistic Glee - and never the fodder while a sacrifice outlet is on the battlefield, because they will sacrifice the target in response, our spell does nothing, and the death still pays them. Shooting Nested Shambler is close to pointless anyway, since its death leaves a Squirrel behind. Killing the pieces that convert deaths into a clock is worth more than any exchange with the bodies that feed them.

Threat deployment tightens up. Lead Tolarian Terror over the remaining copies of Cryptic Serpent and land it with Dispel up - one mana now covers Tragic Slip, Snuff Out, and Supernatural Stamina, and the ward taxes whatever slips through. Many lists also bring extra copies of Accursed Marauder, so sandbag the second threat: the edict takes nothing from an empty board while their half still gives up a creature, and when we do commit, a Delver of Secrets on the battlefield is the designated sacrifice. The same protection extends to our hand: counter Mesmeric Fiend on cast whenever possible, because with an outlet already down they can exile the taken card for good by sacrificing it while its enters trigger is still on the stack, and killing it ourselves in that window locks the exile just the same; once the trigger has resolved, removing it returns the card.

A stocked graveyard becomes a liability after boarding, so cash it in. Rotten Reunion is a bring-in in most of their sideboards that exiles a card from our graveyard at instant speed and leaves a Zombie token behind, with flashback doubling the tax, and about half their lists add Nihil Spellbomb, whose one activation exiles the whole graveyard and pushes both serpents back toward their full seven-mana cost. Cast the serpent on the turn it is cheap rather than waiting for a perfect window: the discount is locked in when the spell is cast, so their exile only hurts if it comes down first. After a Nihil Spellbomb empties our graveyard, keep chaining cantrips - every Thought Scour and Mental Note restocks it three cards at a time - and hold Envelop for the Rite of Consumption that tries to end the game we just stabilized.

Blue Terror

Decklist

Introduction

General Strategy