Ulalek, Fused Atrocity + Writhing Chrysalis + The Peregrine Dynamo

Ulalek, Fused Atrocity

Writhing Chrysalis

The Peregrine Dynamo

How it works

1. Cast Writhing Chrysalis by paying 2.
2. Writhing Chrysalis and Ulalek trigger.
3. Holding priority, activate The Peregrine Dynamo 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.