Blazing Sunsteel, and Polyraptor

Prerequisites

• Blazing Sunsteel on the battlefield
• Polyraptor on the battlefield

Steps

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

Results

• Infinite ETB
• Infinite creature tokens