How can you create a combo with Ulalek, Fused Atrocity, Echoes of Eternity, Writhing Chrysalis?
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[START OF COMBO]This combo can be formed with Ulalek, Fused Atrocity, Echoes of Eternity, Writhing Chrysalis

Color identity: WUBRG
Mana cost: {2}{R}{G}
Steps:
  1. Cast Writhing Chrysalis by paying {2}{R}{G}.
  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 {C}{C}.
  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 {C}{C} 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 {C}{C}.
  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 {C}{C} to copy the Writhing Chrysalis spell, Ulalek's trigger and Writhing Chrysalis' trigger.
  13. Repeat from step 8.[END OF COMBO STEPS]

Result:
  - Infinite +1/+1 counters on an infinite number of creature tokens
  - Infinite copies of abilities you control on the stack
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Ulalek, Fused Atrocity must be on the battlefield
  - Echoes of Eternity must be on the battlefield
  - Writhing Chrysalis must be in your hand
[END OF COMBO PREREQUISITES]
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