Mirror-Mad Phantasm | Unstable Shapeshifter

Cards

({4} magic symbol) ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) available.

Cast
Mirror-Mad Phantasm by paying ({3} magic symbol) ({U} magic symbol) ({U} magic symbol) .
When
Mirror-Mad Phantasm enters the battlefield,
Unstable Shapeshifter triggers, causing
Unstable Shapeshifter to become a copy of
Mirror-Mad Phantasm until end of turn.
Activate
Unstable Shapeshifter by paying ({1} magic symbol) ({U} magic symbol) , shuffling
Unstable Shapeshifter into your library and milling your entire library due to it not having a card named
Mirror-Mad Phantasm in it.