Truefire Captain, and Blazing Sunsteel

Prerequisites

• Truefire Captain on the battlefield
• Blazing Sunsteel on the battlefield
• Blazing Sunsteel attached to Truefire Captain
• You have a way to give Truefire Captain indestructible
• You have a way to deal damage to Truefire Captain

Steps

1. Give Truefire Captain indestructible by any method
2. Deal damage to Truefire Captain
3. Blazing Sunsteel and Truefire Captain trigger
4. Resolve the Truefire Captain trigger, dealing at least 1 damage to any player
5. Resolve the Blazing Sunsteel trigger, dealing at least 1 damage to Truefire Captain
6. Repeat from step 3

Results

• Infinite damage