Mirror-Mad Phantasm + Mirage Mirror

Mirror-Mad Phantasm

Mirage Mirror

How it works

1. Activate Mirage Mirror by paying 2, causing it to become a copy of Mirror-Mad Phantasm until end of turn.
2. Activate Mirage Mirror by paying 1, shuffling Mirage Mirror into your library and milling your entire library due to it not having a card named Mirror-Mad Phantasm in it.

This clever setup leverages a quirk in how copy effects interact with the searching process of Mirror-Mad Phantasm. Because Mirage Mirror is only a copy of the Phantasm until end of turn, it doesn't actually possess the name "Mirror-Mad Phantasm" while tucked away in your library. When you activate its ability, it shuffles itself in and searches endlessly for a card with that specific name, forcing you to mill your entire library in the process.