Mirror-Mad Phantasm, and Absorb Identity

Prerequisites

• Mirror-Mad Phantasm on the battlefield
• Absorb Identity in hand
• You control at least one Shapeshifter
• available

Steps

1. Cast Absorb Identity by paying , returning Mirror-Mad Phantasm to your hand from the battlefield, and causing each Shapeshifter you control to become a copy of Mirror-Mad Phantasm until end of turn
2. Activate a Shapeshifter by paying , shuffling it 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