Raphael, Ninja Destroyer, and Blazing Sunsteel

Prerequisites

• Raphael, Ninja Destroyer on the battlefield
• Blazing Sunsteel on the battlefield

Steps

1. Deal damage to Raphael
2. Raphael and Blazing Sunsteel trigger
3. Resolve the Raphael trigger, adding that much
4. Resolve the Blazing Sunsteel trigger, dealing that much damage to Raphael
5. Repeat from step 2

Results

• Infinite red mana