Color Identity: U, B, R

Prerequisites

  1.  
    Anger
    Anger
    in your graveyard.
  2.  
    Mairsil, the Pretender
    Mairsil
    on the battlefield.
  3.  All other cards in exile.
  4. You control a Mountain.

Steps

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