Cast Writhing Chrysalis by paying {2}{R}{G}.
Writhing Chrysalis and Ulalek trigger.
Holding priority, activate Abstruse Archaic by paying {1} and tapping it, copying Ulalek's trigger.
Resolve the copied Ulalek trigger, causing you to pay {C}{C} and creating a copy of the Writhing Chrysalis spell, Writhing Chrysalis's trigger, and Ulalek's trigger.
Resolve the copied Ulalek trigger, causing you to pay {C}{C} and creating a copy of at least two Writhing Chrysalis spells, at least two Writhing Chrysalis's triggers, and Ulalek's trigger.
Resolve a Writhing Chrysalis trigger, creating two Eldrazi Spawn tokens.
Activate two Eldrazi Spawn tokens by sacrificing them, adding {C}{C}.
Repeat from 5 any number of times.
Once you have infinite copies of the spells and triggers, you can resolve them all, activate any number of Eldrazi Spawn tokens, and trigger all Writhing Chrysalis's final abilities.

Infinite creature LTB

Infinite creature ETB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite colorless mana

Infinite creature tokens

Infinite +1/+1 counters on an infinite number of creature tokens

Ulalek, Fused Atrocity

Writhing Chrysalis

Abstruse Archaic

Deal combat damage to an opponent using Etrata, triggering its ability.
Holding priority, activate Strionic Resonator by paying {2} and tapping it, targeting Etrata's trigger.
Holding priority, activate Abstruse Archaic by paying {1} and tapping it, copying Strionic Resonator's trigger, targeting Etrata's trigger.
Resolve both Strionic Resonator triggers, copying Etrata's trigger twice.
Resolve all Etrata triggers, exiling three creatures an opponent controls and putting hit counters on them, and then causing that opponent to lose the game.

Target opponent loses the game

Etrata, the Silencer

Strionic Resonator

At the beginning of your combat phase, Helm of the Host triggers.
Holding priority, activate The Peregrine Dynamo by paying {1} and tapping it, copying Helm of the Host's trigger.
Activate Abstruse Archaic by paying {1} and tapping it, copying Helm of the Host's trigger.
Resolve all Helm of the Host triggers, creating three token copies of Biovisionary with haste.
At the beginning of your end step, each Biovisionary triggers.
Resolve the first trigger, causing you to win the game.

Win the game

Biovisionary

Helm of the Host

The Peregrine Dynamo

At the beginning of your combat phase, Helm of the Host triggers.
Holding priority, activate Strionic Resonator by paying {2} and tapping it, copying Helm of the Host's trigger.
Activate Abstruse Archaic by paying {1} and tapping it, copying Helm of the Host's trigger.
Resolve all Helm of the Host triggers, creating three token copies of Biovisionary with haste.
At the beginning of your end step, each Biovisionary triggers.
Resolve the first trigger, causing you to win the game.

At the beginning of your combat phase, Helm of the Host triggers.
Holding priority, activate Lithoform Engine's first ability by paying {2} and tapping it, copying Helm of the Host's trigger.
Activate Abstruse Archaic by paying {1} and tapping it, copying Helm of the Host's trigger.
Resolve all Helm of the Host triggers, creating three token copies of Biovisionary with haste.
At the beginning of your end step, each Biovisionary triggers.
Resolve the first trigger, causing you to win the game.

Lithoform Engine

Deal combat damage to an opponent using the creature that has Biorganic Carapace attached, triggering it.
Holding priority, activate Abstruse Archaic by paying {1} and tapping it, copying the creature's trigger.
Resolve the copy of the creature's ability, drawing a card for each modified creature you control.
Holding priority, activate Mind Over Matter by discarding a card, untapping Abstruse Archaic.
Activate Mind Over Matter by discarding a card, untapping a mana-producing permanent.
Activate the mana-producing permanent by tapping it, adding {1}.
Repeat from step 2.

Combos with "Abstruse Archaic"