Boros Reckoner, and Eldrazi Monument

Prerequisites

• Boros Reckoner on the battlefield
• Eldrazi Monument on the battlefield
• You have a way to give Boros Reckoner lifelink
• You have a way to deal damage to Boros Reckoner

Steps

1. Give Boros Reckoner lifelink
2. Deal damage to Boros Reckoner
3. Boros Reckoner triggers, dealing that much damage to itself and causing you to gain that much life
4. Repeat step 4 any number of times

Results

• Infinite lifegain
• Infinite lifegain triggers