Protector of the Crown, and Arcbond

Prerequisites

• Protector of the Crown on the battlefield
• Arcbond in hand
• undefined available

Steps

1. Give Protector of the Crown indestructible, if needed
2. Cast Arcbond by paying , targeting Protector of the Crown
3. Deal damage to Protector of the Crown
4. Arcbond triggers, dealing damage to each creature and player equal to the damage dealt to Protector of the Crown, with the damage that would be dealt to you being dealt to Protector of the Crown instead
5. Repeat from step 4

Results

• Infinite damage