Basalt Monolith, and Mesmeric Orb

Prerequisites

• Basalt Monolith on the battlefield
• Mesmeric Orb on the battlefield

Steps

1. Activate Basalt Monolith's first ability by tapping it, adding
2. Activate Basalt Monolith's last ability by paying , untapping it
3. Mesmeric Orb triggers, causing you to mill a card
4. Repeat

Results

• Infinite self-mill