Ghostface, Sinister Slasher

Whenever Ghostface, Sinister Slasher attacks, exile it and two other face-up creatures you control in a face-down pile, shuffle that pile, then return them to the battlefield cloaked, tapped, and attacking. When one or more face-down creatures you control deal combat damage to a player this turn, they choose a face-down attacking creature you control and turn it face-up. If Ghostface is turned face-up this way, sacrifice it. Otherwise, that player loses half their life, rounded down.