the front side of Animar, Soul of Elements
the back of a classic MtG card
the front side of Cloudstone Curio
the back of a classic MtG card
the front side of Endless One
the back of a classic MtG card
the front side of Eternal Scourge
the back of a classic MtG card

Color Identity: G, U, R

Initial Card State

  1.  Endless One in hand.
  2.  All other permanents on the battlefield.

Notable Prerequisites

  1. Animar has at least two +1/+1 counters on it.

Steps

  1. Cast Endless One, choosing one for X, but paying ({0} magic symbol)   due to Animar.
  2. Animar triggers, putting a +1/+1 counter on itself.
  3. Endless One enters the battlefield, triggering Cloudstone Curio, returning Eternal Scourge from the battlefield to your hand.
  4. Cast Eternal Scourge by paying ({0} magic symbol)  .
  5. Animar triggers, putting a +1/+1 counter on itself.
  6. Eternal Scourge enters the battlefield, triggering Cloudstone Curio, returning Endless One from the battlefield to your hand.
  7. Repeat.

Results

  1. Infinite ETB.
  2. Infinite LTB.
  3. Infinite storm count.
  4. Infinite +1/+1 counters on a creature.
  5. Infinite +1/+1 counters on certain creatures.

Metadata

  1. In 72 decks according to EDHREC.
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