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We are the control deck here and they are the aggressor. Black Sacrifice attacks with one-mana creatures from their first land while our Bridges enter tapped, so their clock is running before our first sweep or blocker is on the table, and the die roll matters more to them than to us: on the play their one-drops get an extra attack in before we catch up. Everything after that favors us. Their death triggers rebuild a board after a sweep, but a second stacked Krark-Clan Shaman ping kills the Squirrel and Mercenary tokens too, nothing in their lists removes a noncreature artifact or counters a spell, and once Carrion Feeder and Mortician Beetle are answered their draws are 1/1s that need a sacrifice outlet to matter, while each Fanatical Offering draws two. They have to race: land a grown Carrion Feeder and a Rite of Consumption drain before Cast Down, stacked pings, and Writhing Chrysalis's blockers take the board, because their Snuff Out, Shambling Ghast trigger, and Accursed Marauder kill our creatures without slowing the draw spells that win us a long game. Attack with Writhing Chrysalis and Refurbished Familiar only once the board is swept.
Cast Down the first Carrion Feeder or Mortician Beetle instead of holding it for something bigger: left in play beside other creatures, either one grows every time they sacrifice, including in response to our pings. When the sweep comes, stack at least two Krark-Clan Shaman activations before the first resolves, so the first ping kills their creatures and the second kills the tokens the death triggers leave. If they have a sacrifice outlet with creatures to feed it, or Sadistic Glee on a creature, cast Toxin Analysis on the Shaman first: the pings gain deathtouch and destroy every creature without flying at any size, which beats their answer of growing Carrion Feeder or Mortician Beetle in response, and the Clue it leaves is another artifact to sacrifice. Our own Writhing Chrysalis and Spawn die to it as well, so it is a reset, not a one-sided sweep. While Mortician Beetle is in play, pay for Fanatical Offering, Eviscerator's Insight, and Makeshift Munitions with artifacts and do not cash Eldrazi Spawn in for mana: every creature we sacrifice puts a counter on it.
Two timing habits close the remaining gaps. Keep one Nihil Spellbomb on the table instead of feeding it to the first ping: activated with the Supernatural Stamina return trigger on the stack it leaves that creature exiled, and in response to Unearth it leaves the spell without a target. And kill their largest creature on our turn or during their combat rather than waiting for the drain: Rite of Consumption's sacrifice is paid as a cost, so removal held for the drain itself has nothing to respond to, while a Cast Down cast earlier cannot be answered with a sorcery.
Carrion Feeder is a free sacrifice outlet that keeps its counters, so every creature doomed by our Cast Down or Krark-Clan Shaman pings becomes permanent power on it, held for an attack or a later Rite of Consumption. Do not sweep into it while they have other creatures to feed it: they sacrifice them in response and it outgrows the pings on the stack. It cannot block and has no trample, so an Eldrazi Spawn absorbs its attack at any size, which is why the danger is the drain that follows the attack rather than the combat itself.
Rite of Consumption is their one source of direct damage and the way an attacker we chump-blocked still hurts us: a Carrion Feeder or pumped Bloodthrone Vampire stopped by a Spawn is sacrificed after combat for its full power, and the life they gain undoes our Refurbished Familiar attacks. Leaving their largest creature alive into their second main phase is the mistake it punishes, because the sacrifice is a cost and no removal can respond once the spell is cast.
Mortician Beetle grows whenever either player sacrifices a creature, so our own sacrifice costs feed it: a Spawn sacrificed for mana, a creature paid to Fanatical Offering or Makeshift Munitions, and our half of Accursed Marauder each add a counter and take it out of range of the pings. Unlike Carrion Feeder it can block, so it also stands in front of Writhing Chrysalis once it has grown.
Bloodthrone Vampire is their second free sacrifice outlet: each creature it eats in response to the pings gives it +2/+2 until end of turn, and that pump still counts when it is sacrificed to Rite of Consumption the same turn. Chump-blocking it and leaving it alive invites exactly that sequence, pump during combat and drain after. Cast Down kills it through any amount of pump.
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Breath Weapon comes in because two damage to every creature at instant speed kills their 1-toughness board, a Carrion Feeder or Mortician Beetle carrying one counter, and the flying Insect tokens Krark-Clan Shaman cannot hit, and it needs no artifacts. It also kills our own Refurbished Familiar and Spawn, so it is cast before those are committed.
Weather the Storm comes in as instant lifegain that grows with the one-mana spells they chain in a turn and can be cast in response to Rite of Consumption to offset the drain. Two copies rather than three: once the board is swept their damage stops, so the life only has to cover the early attacks and one drain, and the third would replace a card that kills creatures or draws.
Eviscerator's Insight goes out because it competes with Krark-Clan Shaman for artifacts, and a creature paid to it puts a counter on Mortician Beetle. Fanatical Offering stays because it gives back a Map token, an artifact for the next ping, while Insight's only extra is a five-mana flashback.
Nyxborn Hydra goes out because Snuff Out, free for 4 life when they control a Swamp and able to hit the Hydra because it is nonblack, and Tragic Slip with morbid each kill it at any size, so whatever we pay for X trades for one cheap card. Unlike Writhing Chrysalis and Refurbished Familiar, it leaves nothing behind when it dies.
One Cleansing Wildfire goes out because their lands are basic Swamps, so the spell is only ramp and a card against them, and a Wildfire in the early turns is mana not spent on their board. Three stay because ramping into Writhing Chrysalis a turn ahead of schedule is our best defensive start.
Sideboarding moves this matchup moderately further in our favor: we add two instant sweeps that need no artifacts and reach their fliers plus lifegain against the drain, while their bring-ins are mostly kill spells aimed at creatures we can sacrifice in response for two cards.
Breath Weapon takes us to five sweepers and adds one that kills the flying Insect tokens, while their extra Tragic Slip and Accursed Marauder copies make our creatures harder to keep, so post-board games turn on sweeps and card draw rather than on holding a blocker. Cast Breath Weapon on their turn after attackers are declared, so the attackers die before dealing damage and the tokens their death triggers leave miss the attack. It also kills our own Refurbished Familiar, Krark-Clan Shaman, and Eldrazi Spawn, so use it while Writhing Chrysalis is our only creature or before the Familiars come down. The tokens arrive after it has resolved, so keep a Shaman activation for the Squirrels and Mercenaries.
Weather the Storm is for the turn they try to finish. Cast it in response to Rite of Consumption, or to the last of several one-mana spells, so every spell cast before it that turn adds a copy; cast early in a quiet turn it gains three life and nothing more.