Color Identity: U, B, R

Initial Card State

  1.  Mairsil and Fervor on the battlefield.
  2.  All other permanents in exile.

Steps

  1. Activate Mairsil using Cauldron of Souls' ability by tapping it, giving itself persist until end of turn.
  2. Activate Mairsil using Blood Vassal's ability by sacrificing it, adding ({B} magic symbol)  ({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 Vassal's ability by sacrificing it, adding ({B} magic symbol)  ({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 2 decks according to EDHREC.

Bracket Tag

This combo has been estimated to be Exhibition (Bracket 1+).



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