Requires

Ulalek, Fused Atrocity must be on the battlefield. Echoes of Eternity must be on the battlefield. Writhing Chrysalis must be in hand. Mana needed:

Steps

1. Cast Writhing Chrysalis by paying .
2. Ulalek and Writhing Chrysalis' first ability triggers twice, and Echoes of Eternity triggers once.
3. Resolve one of Writhing Chrysalis' triggers, creating two 0/1 Eldrazi Spawn creature tokens.
4. Activate both Eldrazi Spawn creature tokens by sacrificing it, adding .
5. Resolve the Echoes of Eternity trigger, copying the Writhing Chrysalis spell.
6. Resolve the copy of the Writhing Chrysalis spell, creating a token copy of it.
7. Resolve one of Ulalek's triggers, causing you to pay to copy the Writhing Chrysalis spell, Ulalek's trigger and Writhing Chrysalis' trigger.
8. Resolve the copy of the Writhing Chrysalis spell.
9. Resolve the copy of Writhing Chrysalis' trigger, creating two 0/1 Eldrazi Spawn creature tokens.
10. Activate both Eldrazi Spawn creature tokens by sacrificing it, adding .
11. Each Writhing Chrysalis you control triggers twice, putting two +1/+1 counters on each of them.
12. Resolve the copy of Ulalek's trigger from step 7, causing you to pay to copy the Writhing Chrysalis spell, Ulalek's trigger and Writhing Chrysalis' trigger.
13. Repeat from step 8.

Results