Mirror-Mad Phantasm, and Cephalid Facetaker

Prerequisites

• Mirror-Mad Phantasm on the battlefield
• Cephalid Facetaker on the battlefield
• available

Steps

1. At the beginning of your combat phase, Cephalid Facetaker triggers, causing it to become a copy of Mirror-Mad Phantasm until end of turn
2. Activate Cephalid Facetaker by paying , shuffling Cephalid Facetaker into your library and milling your entire library due to it not having a card named Mirror-Mad Phantasm in it

Results

• Infinite self-mill