Mirror-Mad Phantasm + Quasiduplicate

Mirror-Mad Phantasm

Quasiduplicate

How it works

1. Cast Quasiduplicate by paying its mana cost, creating a token copy of Mirror-Mad Phantasm.
2. Activate the Mirror-Mad Phantasm token by paying 1, shuffling the token into your library and milling your entire library due to it not having a card named Mirror-Mad Phantasm in it.

This clever interaction turns a quirk of naming mechanics into a massive self-mill engine. By using Quasiduplicate to create a token copy of Mirror-Mad Phantasm, you set up a situation where the token's activation cannot find a card with its own exact name in your library. When you pay {1}{U} to activate the token, it gets shuffled away, but the search continues through your entire library until the bitter end, dumping every single card straight into your graveyard.