Repercussion, Indoraptor, the Perfect Hybrid, and Pariah's Shield

Prerequisites

• Repercussion on the battlefield
• Indoraptor, the Perfect Hybrid on the battlefield
• Pariah's Shield 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 Pariah's Shield
5. Repeat from step 2

Results

• Infinite damage