Magical Hats

Cast this spell only before attackers are declared.
Exile all nontoken creatures you control and all instants and sorceries from your graveyard in a
face-down pile, shuffle that pile then put them
on the battlefield. They're 2/2 creatures.
At the end of the combat phase, put all face-down noncreature cards you control into the graveyard,
then turn all face-down cards you control
face-up.