Hawkeye's Bow, and Aphetto Alchemist

Prerequisites

• Hawkeye's Bow on the battlefield
• Aphetto Alchemist on the battlefield

Steps

1. Activate Aphetto Alchemist by tapping it, targeting itself
2. Hawkeye's Bow triggers, dealing 1 damage to each opponent
3. Resolve the Aphetto Alchemist ability, untapping it
4. Repeat

Results

• Infinite damage