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