Serrated Biskelion + Thornbite Staff + Thran Vigil + Ashnod's Altar + Geralf's Messenger

Serrated Biskelion
Thornbite Staff
Thran Vigil
Ashnod's Altar
Geralf's Messenger

Requires
Serrated Biskelion must be on the battlefield. Thornbite Staff must be on the battlefield. Thran Vigil must be on the battlefield. Ashnod's Altar must be on the battlefield. Geralf's Messenger must be on the battlefield. Serrated Biskelion does not have summoning sickness. Thornbite Staff attached to Serrated Biskelion. Geralf's Messenger does not have more than one +1/+1 counter on it.
Steps
  1. Activate Serrated Biskelion by tapping it, putting a -1/-1 counter on it and Geralf's Messenger.
  2. Activate Ashnod's Altar by sacrificing Geralf's Messenger, adding .
  3. When Geralf's Messenger dies, its undying ability and Serrated Biskelion trigger.
  4. Resolve the Serrated Biskelion trigger, untapping it.
  5. Resolve the Geralf's Messenger trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  6. When Geralf's Messenger enters the battlefield, it and Thran Vigil trigger.
  7. Resolve the Geralf's Messenger trigger, causing an opponent to lose 2 life.
  8. Resolve the Thran Vigil trigger, putting a +1/+1 counter on Serrated Biskelion.
  9. Repeat.
Results
Infinite colorless mana. Infinite death triggers. Infinite ETB. Infinite lifeloss. Infinite LTB. Infinite sacrifice triggers.

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