Polymorphous Rush by paying ({2} magic symbol) ({U} magic symbol) , causing another creature you control to become a copy of
Mirror-Mad Phantasm until end of turn.
Activate the creature by paying ({1} magic symbol) ({U} magic symbol) , 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.
Metadata
In 4 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Spicy (Bracket 3-4+).