Ulalek, Fused Atrocity + Writhing Chrysalis + Abstruse Archaic

Ulalek, Fused Atrocity

Writhing Chrysalis

Abstruse Archaic

How it works

1. Cast Writhing Chrysalis by paying 2.
2. Writhing Chrysalis and Ulalek trigger.
3. Holding priority, activate Abstruse Archaic by paying 1 and tapping it, copying Ulalek's trigger.
4. Resolve the copied Ulalek trigger, causing you to pay CC and creating a copy of the Writhing Chrysalis spell, Writhing Chrysalis's trigger, and Ulalek's trigger.
5. Resolve the copied Ulalek trigger, causing you to pay CC and creating a copy of at least two Writhing Chrysalis spells, at least two Writhing Chrysalis's triggers, and Ulalek's trigger.
6. Resolve a Writhing Chrysalis trigger, creating two Eldrazi Spawn tokens.
7. Activate two Eldrazi Spawn tokens by sacrificing them, adding CC.
8. Repeat from 5 any number of times.
9. 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.

This recursive loop turns a single cast into an overwhelming swarm of Eldrazi. By leveraging Ulalek, Fused Atrocity's ability to copy your spells and triggers whenever you cast an Eldrazi, you can bootstrap the process using Abstruse Archaic to copy the initial Ulalek trigger on the stack. As the copies snowball, the cast triggers from Writhing Chrysalis flood your board with Eldrazi Spawn tokens, which you then sacrifice for the colorless mana needed to repeatedly pay Ulalek's cost.