Light of Promise, and Walking Ballista

Prerequisites

• Light of Promise on the battlefield
• Walking Ballista on the battlefield
• Light of Promise attached to Walking Ballista
• Walking Ballista has at least two +1/+1 counters on it
• You have a way to give Walking Ballista lifelink

Steps

1. Give Walking Ballista lifelink
2. Activate Walking Ballista by removing a +1/+1 counter from it, dealing 1 damage to any target and casuing you to gain 1 life
3. Light of Promise triggers, putting a +1/+1 counter on Walking Ballista
4. Repeat from step 2

Results

• Infinite damage
• Infinite lifegain
• Infinite lifegain triggers