Color Identity: B

Prerequisites

  1.  All permanents on the battlefield.
  2. Soulstinger
    Soulstinger     does not have a +1/+1 counter on it.

Steps

  1. Activate
    Phyrexian Altar
    Phyrexian Altar     by sacrificing
    Soulstinger
    Soulstinger    , adding one mana of any color.
  2. When
    Soulstinger
    Soulstinger     dies, its second and undying abilities trigger.
  3. Resolve the first trigger, allowing you to put a number of -1/-1 counters on a creature equal to the number that were on
    Soulstinger
    Soulstinger    .
  4. Resolve the undying trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  5. When
    Soulstinger
    Soulstinger     enters the battlefield, its first ability triggers, putting two -1/-1 counters on it.
  6. Repeat.

Results

  1. Infinite -1/-1 counters.
  2. Infinite colored mana.
  3. Infinite death triggers.
  4. Infinite ETB.
  5. Infinite LTB.
  6. Infinite sacrifice triggers.

Metadata

  1. In 42 decks according to EDHREC.
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