Color Identity: U, B

Prerequisites

  1.  All permanents on the battlefield.

Steps

  1. Activate
    Ashnod's Altar
    Ashnod's Altar
    by sacrificing
    Spark Double
    Spark Double
    , adding ({C} magic symbol)  ({C} magic symbol)  .
  2. When
    Spark Double
    Spark Double
    dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  3. As
    Spark Double
    Spark Double
    enters the battlefield, choose to have it enter the battlefield as a copy of
    Putrid Goblin
    Putrid Goblin
    with a +1/+1 counter on it.
  4. Repeat.

Results

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

Metadata

  1. In 45 decks according to EDHREC.
footer