Hornet Nest, and Warstorm Surge

Prerequisites

• Hornet Nest on the battlefield
• Warstorm Surge on the battlefield
• You have a way to give Hornet Nest indestructible
• You have a way to deal damage to Hornet Nest

Steps

1. Give Hornet Nest indestructible by any method
2. Deal damage to Hornet Nest
3. Hornet Nest triggers, creating at least one 1/1 Insect creature token
4. The Insect enters the battlefield, triggering Warstorm Surge, causing the Insect to deal one damage to Hornet Nest
5. Repeat from step 3

Results

• Infinite creature tokens
• Infinite ETB