Horseshoe Crab, Mesmeric Orb, and Earthcraft

Prerequisites

• Horseshoe Crab on the battlefield
• Mesmeric Orb on the battlefield
• Earthcraft on the battlefield
• You control a basic Island

Steps

1. Activate Earthcraft by tapping Horseshoe Crab, untapping the Island
2. Mesmeric Orb triggers, causing you to mill a card
3. Activate the Island by tapping it, adding
4. Activate Horseshoe Crab by paying , untapping Horseshoe Crab
5. Mesmeric Orb triggers, causing you to mill a card
6. Repeat

Results

• Infinite self-mill
• Infinite tap triggers