Walking Ballista, and Heroic Feast

Prerequisites

• Walking Ballista on the battlefield
• Heroic Feast on the battlefield

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 causing you to gain 1 life
3. Heroic Feast triggers, putting a +1/+1 counter on Walking Ballista
4. Repeat

Results

• Infinite damage
• Infinite lifegain
• Infinite lifegain triggers