Spider-Man, Peter Parker, and Walking Ballista

Prerequisites

• Spider-Man, Peter Parker on the battlefield
• Walking Ballista 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. Spider-Man triggers, putting a +1/+1 counter on Walking Ballista
4. Repeat

Results

• Infinite damage
• Infinite lifegain triggers
• Infinite lifegain