Lacerating Giganotosaurus

Flash, first strike, trample
When Lacerating Giganotosaurus enters the
battlefield, its fights target creature with greater
power you don't control.
{x}{r/g}, Discard a card: Lacerating Giganotosaurus
gains +X/-X until end of turn.
At the beginning of your end step, if no creature
an opponent controls has died this turn, return
Lacerating Giganotosaurus to your hand.