Sonic the Hedgehog, Yotian Dissident, and Walking Ballista

Prerequisites

• Sonic the Hedgehog on the battlefield
• Yotian Dissident on the battlefield
• Walking Ballista on the battlefield

Steps

1. Activate Walking Ballista by removing a +1/+1 counter from it, dealing 1 damage to the creature with indestructible
2. Sonic's second ability triggers, creating a tapped Treasure token
3. When the Treasure enters the battlefield, Yotian Dissident triggers, putting a +1/+1 counter on Walking Ballista
4. Repeat

Results

• Infinite tapped Treasure tokens