Color Identity: U, B, R

Prerequisites

  1.  
    Mairsil, the Pretender
    Mairsil
    and
    Mass Hysteria
    Mass Hysteria
    on the battlefield.
  2.  All other permanents in exile.

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 1 deck according to EDHREC.
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