Animar, Soul of Elements, Cloudstone Curio, Ugin's Conjurant, and Eternal Scourge

Prerequisites

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

Steps

1. Cast Ugin's Conjurant, choosing one for X, but paying due to Animar
2. Animar triggers, putting a +1/+1 counter on itself
3. Ugin's Conjurant 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 Ugin's Conjurant from the battlefield to your hand
7. Repeat

Results

• Infinite +1/+1 counters on Animar and Ugin's Conjurant
• Infinite ETB
• Infinite LTB
• Infinite storm count
• Infinite +1/+1 counters on Animar