Guilty Conscience, and Boros Reckoner

Prerequisites

• Guilty Conscience on the battlefield
• Boros Reckoner on the battlefield

Steps

1. Deal damage to Boros Reckoner
2. Boros Reckoner triggers, dealing damage to any target Guilty Conscience triggers, dealing damage to Boros Reckoner
3. Repeat from step 2

Results

• Infinite damage