Repercussion, Indoraptor, the Perfect Hybrid, and With Great Power...

Prerequisites

• Repercussion on the battlefield
• Indoraptor, the Perfect Hybrid on the battlefield
• With Great Power
• on the battlefield

Steps

1. Deal damage to Indoraptor
2. Indoraptor and Repercussion trigger
3. Resolve the Indoraptor trigger, dealing damage to an opponent unless they sacrifice a nontoken creature
4. Resolve the Repercussion trigger, dealing damage to Indoraptor instead of you due to With Great Power
5. Repeat from step 2

Results

• Infinite damage