Pink Horror + Nim Deathmantle + Ashnod's Altar

Pink Horror
Nim Deathmantle
Ashnod's Altar

Requires
Pink Horror must be on the battlefield. Nim Deathmantle must be on the battlefield. Ashnod's Altar must be on the battlefield.
Steps
  1. Activate Ashnod's Altar by sacrificing Pink Horror, adding .
  2. Pink Horror dies, triggering itself and Nim Deathmantle.
  3. Resolve the Pink Horror trigger, creating two 2/2 Blue Horror creature tokens.
  4. Activate Ashnod's Altar by sacrificing a Blue Horror, adding .
  5. Resolve the Nim Deathmantle trigger from step 2, paying 4 to return Pink Horror from your graveyard to the battlefield and attach Nim Deathmantle to it.
  6. Repeat.
  7. Once you have infinite Blue Horror tokens, you may cast an instant or sorcery spell to deal infinite damage to any number of targets.
Results
Infinite colorless mana. Infinite creature tokens. Infinite damage. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers.

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