Blazing Sunsteel, and Raptor Hatchling

Prerequisites

• Blazing Sunsteel on the battlefield
• Raptor Hatchling on the battlefield

Steps

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

Results

• Infinite ETB
• Infinite creature tokens