Mirror-Mad Phantasm, and Mercurial Pretender

Prerequisites

• Mirror-Mad Phantasm in hand or on the battlefield or in the command zone or in exile or in the graveyard
• Mercurial Pretender on the battlefield
• Mercurial Pretender is a copy of Mirror-Mad Phantasm
• available

Steps

1. Activate Mercurial Pretender by paying , shuffling Mercurial Pretender 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