Hawkeye's Bow, Kelpie Guide, and North Pole Patrol

Prerequisites

• Hawkeye's Bow on the battlefield
• Kelpie Guide on the battlefield
• North Pole Patrol on the battlefield

Steps

1. Activate Kelpie Guide by tapping it, targeting North Pole Patrol
2. If Kelpie Guide has Hawkeye's Bow attached to it, Hawkeye's Bow triggers, dealing 1 damage to each opponent
3. Resolve the Kelpie Guide ability, untapping North Pole Patrol
4. Activate North Pole Patrol by tapping it, targeting Kelpie Guide
5. If North Pole Patrol has Hawkeye's Bow attached to it, Hawkeye's Bow triggers, dealing 1 damage to each opponent
6. Resolve the North Pole Patrol ability, untapping Kelpie Guide
7. Repeat

Results

• Infinite damage