Color Identity: U, B

Prerequisites

  1.  All permanents on the battlefield.

Steps

  1. Activate
    Ashnod's Altar
    Ashnod's Altar     by sacrificing
    River Kelpie
    River Kelpie    , adding ({C} magic symbol)  ({C} magic symbol)  .
  2. River Kelpie
    River Kelpie    's persist and undying abilities trigger.
  3. Resolve the persist trigger, returning
    River Kelpie
    River Kelpie     from your graveyard to the battlefield with a -1/-1 counter on it.
  4. River Kelpie
    River Kelpie     enters the battlefield, causing you to draw.
  5. The undying trigger fails to resolve because
    River Kelpie
    River Kelpie     is not in your graveyard.
  6. Activate
    Ashnod's Altar
    Ashnod's Altar     by sacrificing
    River Kelpie
    River Kelpie    , adding ({C} magic symbol)  ({C} magic symbol)  .
  7. River Kelpie
    River Kelpie    's undying and persist abilities trigger.
  8. Resolve the undying trigger, returning
    River Kelpie
    River Kelpie     from your graveyard to the battlefield with a +1/+1 counter on it.
  9. River Kelpie
    River Kelpie     enters the battlefield, causing you to draw a card.
  10. The persist trigger fails to resolve because
    River Kelpie
    River Kelpie     is not in your graveyard.
  11. Repeat.

Results

  1. Infinite card draw.
  2. Near-infinite colorless mana.
  3. Near-infinite death triggers.
  4. Near-infinite ETB.
  5. Near-infinite LTB.
  6. Near-infinite sacrifice triggers.

Metadata

  1. In 1421 decks according to EDHREC.
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