the front side of Phantom Steed
the back of a classic MtG card
the front side of Karmic Guide
the back of a classic MtG card
the front side of Ashnod's Altar
the back of a classic MtG card

Color Identity: W, U

Initial Card State

  1.  Karmic Guide in exile (exiled by Phantom Steed).
  2.  Phantom Steed and Ashnod's Altar on the battlefield.

Steps

  1. Activate Ashnod's Altar by sacrificing Phantom Steed, adding ({C} magic symbol)  ({C} magic symbol)  .
  2. Phantom Steed leaves the battlefield, returning Karmic Guide from exile to the battlefield.
  3. Karmic Guide enters the battlefield, returning Phantom Steed from your graveyard to the battlefield.
  4. Phantom Steed enters the battlefield, exiling Karmic Guide until Phantom Steed leaves the battlefield.
  5. Repeat.

Results

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

Metadata

  1. In 113 decks according to EDHREC.
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