Mrs. Puff

Flash
Boat Crash — When Mrs. Puff enters
the battlefield, destroy up to one target
legendary permanent. That permanent's
controller creates a Junk token. (It's an artifact with "{t}, Sacrifice this artifact: Exile the top
card of your library. You may play that card
this turn. Activate only as a sorcery.")
"Oh, SpongeBob, why?" - Mrs. Puff