Blazing Sunsteel, and Overgrown Armasaur

Prerequisites

• Blazing Sunsteel on the battlefield
• Overgrown Armasaur on the battlefield

Steps

1. Deal damage to Overgrown Armasaur
2. Overgrown Armasaur and Blazing Sunsteel trigger
3. Resolve the Overgrown Armasaur trigger, creating a creature token
4. Resolve the Blazing Sunsteel trigger, dealing damage to Overgrown Armasaur
5. Repeat from step 2

Results

• Infinite ETB
• Infinite creature tokens