Mirror-Mad Phantasm + Renegade Doppelganger

Mirror-Mad Phantasm

Renegade Doppelganger

How it works

1. Cast Mirror-Mad Phantasm by paying 3.
2. When Mirror-Mad Phantasm enters the battlefield, Renegade Doppelganger triggers, causing Renegade Doppelganger to become a copy of Mirror-Mad Phantasm until end of turn.
3. Activate Renegade Doppelganger by paying 1, shuffling Renegade Doppelganger into your library and milling your entire library due to it not having a card named Mirror-Mad Phantasm in it.