Color Identity: B

Prerequisites

  1.  All permanents on the battlefield.

Steps

  1. Activate
    Phyrexian Altar
    Phyrexian Altar     by sacrificing
    Carnifex Demon
    Carnifex Demon    , adding one mana of any color.
  2. Carnifex Demon
    Carnifex Demon     dies, triggering its undying ability, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  3. Repeat.

Results

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

Metadata

  1. In 165 decks according to EDHREC.
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