Repercussion, Truefire Captain, and With Great Power...

Prerequisites

• Repercussion on the battlefield
• Truefire Captain on the battlefield
• With Great Power
• on the battlefield

Steps

1. Deal damage to Truefire Captain
2. Truefire Captain and Repercussion trigger
3. Resolve the Truefire Captain trigger, dealing damage to an applicable target
4. Resolve the Repercussion trigger, dealing damage to Truefire Captain instead of you due to With Great Power
5. Repeat from step 2

Results

• Infinite damage to target player