Ulalek, Fused Atrocity, Echoes of Eternity, and Writhing Chrysalis

Prerequisites

• Ulalek, Fused Atrocity on the battlefield
• Echoes of Eternity on the battlefield
• Writhing Chrysalis in hand
• available

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. Resolve the Echoes of Eternity trigger, copying the Writhing Chrysalis spell
5. Resolve the copy of the Writhing Chrysalis spell, creating a token copy of it
6. Activate both Eldrazi Spawn creature tokens by sacrificing it, adding
7. Writhing Chrysalis triggers twice for each Eldrazi sacrificed, putting a total of four +1/+1 counters on itself
8. Resolve one of Ulalek's triggers, causing you to pay to copy the Writhing Chrysalis spell, Ulalek's trigger and Writhing Chrysalis' trigger
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. Writhing Chrysalis triggers twice for each Eldrazi sacrificed, putting a total of four +1/+1 counters on itself
12. Resolve the copy of Ulalek's trigger from step 7, causing you to pay to copy each Writhing Chrysalis spell, Ulalek's trigger and Writhing Chrysalis' trigger
13. Repeat from step 8 any number of times
14. End the combo by letting the stack resolve, putting an infinite number of Writhing Chrysalis tokens onto the battlefield

Results

• Infinite copies of abilities you control on the stack
• Infinite creature tokens
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite +1/+1 counters on a creature