Nested Ghoul, and Warstorm Surge

Prerequisites

• Nested Ghoul on the battlefield
• Warstorm Surge on the battlefield
• You have a way to give Nested Ghoul indestructible
• You have a way to deal damage to Nested Ghoul

Steps

1. Give Nested Ghoul indestructible by any method
2. Deal damage to Nested Ghoul
3. Nested Ghoul triggers, creating a 2/2 Phyrexian Zombie creature token
4. The Phyrexian Zombie enters the battlefield, triggering Warstorm Surge, causing the Phyrexian Zombie to deal damage equal to its power to Nested Ghoul
5. Repeat from step 3

Results

• Infinite creature tokens
• Infinite ETB