Cephalid Illusionist, and Outrider en-Kor

Prerequisites

• Cephalid Illusionist on the battlefield
• Outrider en-Kor on the battlefield

Steps

1. Activate Outrider en-Kor by paying , targeting Cephalid Illusionist
2. Cephalid Illusionist triggers, causing you to mill three cards
3. Resolve the Outrider en-Kor ability
4. Repeat

Results

• Infinite self-mill