Color Identity: U, B, R

Initial Card State

  1.  Mairsil on the battlefield.
  2.  Anger in your graveyard.
  3.  All other permanents in exile.

Notable Prerequisites

  1. You control a Mountain.

Steps

  1. Activate Mairsil using Cauldron of Souls' ability by tapping it, giving itself persist until end of turn.
  2. Activate Mairsil using Blood Pet's ability by sacrificing it, adding ({B} magic symbol)  .
  3. When Mairsil dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  4. Activate Mairsil using Endling's third ability by paying ({B} magic symbol)  , giving Mairsil undying until end of turn.
  5. Activate Mairsil using Blood Pet's ability by sacrificing it, adding ({B} magic symbol)  .
  6. When Mairsil dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  7. Repeat.

Results

  1. Infinite black mana.
  2. Infinite death triggers.
  3. Infinite ETB.
  4. Infinite LTB.
  5. Infinite sacrifice triggers.

Metadata

  1. In 8 decks according to EDHREC.
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