Animar, Soul of Elements, Cloudstone Curio, Endless One, and Eternal Scourge

Prerequisites

• Animar, Soul of Elements on the battlefield
• Cloudstone Curio on the battlefield
• Endless One in hand
• Eternal Scourge on the battlefield
• Animar has at least two +1/+1 counters on it

Steps

1. Cast Endless One, choosing one for X, but paying 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
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

• Infinite +1/+1 counters on Animar and Endless One
• Infinite ETB
• Infinite LTB
• Infinite storm count
• Infinite +1/+1 counters on Animar