Soul-Mold Spellfist

Flash
When Soul-Mold Spellfist enters the battlefield
or is turned face up, the owner of target instant
or sorcery spell puts it onto the battlefield face
down. It's a 2/2 creature with "If this permanent
would leave the battlefield, exile it instead of
putting it anywhere else. Until the end of your
next turn, you may cast it."
Megamorph {1}{r}