Repercussion, Brash Taunter, and With Great Power...

Prerequisites

• Repercussion on the battlefield
• Brash Taunter on the battlefield
• With Great Power
• on the battlefield

Steps

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

Results

• Infinite damage to target opponent