Princess Celestia, Cursed

+1: Give target creature -1/-1 until end of turn.
-3: Sacrifice target Unicorn you control, target player discards X amount of cards from the top of their library, X being the Unicorn's power.
-7: You get an emblem with, "As long as you control a "Princess Celestia, Cursed", every creature you control gains Infect."