Overgrown Armasaur, and Warstorm Surge

Prerequisites

• Overgrown Armasaur on the battlefield
• Warstorm Surge on the battlefield
• You have a way to give Overgrown Armasaur indestructible
• You have a way to deal damage to Overgrown Armasaur

Steps

1. Give Overgrown Armasaur indestructible by any method
2. Deal damage to Overgrown Armasaur
3. Overgrown Armasaur triggers, creating a 1/1 Saproling creature token
4. The Saproling enters the battlefield, triggering Warstorm Surge, causing the Saproling to deal one damage to Overgrown Armasaur
5. Repeat from step 3

Results

• Infinite creature tokens
• Infinite ETB