Blazing Sunsteel, and Truefire Captain

Prerequisites

• Blazing Sunsteel on the battlefield
• Truefire Captain on the battlefield

Steps

1. Deal damage to Truefire Captain
2. Truefire Captain and Blazing Sunsteel trigger
3. Resolve the Truefire Captain trigger, dealing damage to any player
4. Resolve the Blazing Sunsteel trigger, dealing damage to Truefire Captain
5. Repeat from step 2

Results

• Infinite damage