Vaevictus, the Savage

+2: You may sacrifice a creature. If you do, another target creature you control gets +X/+X and trample, where X is the sacrificed creature's power.
-3: . Untap a creature and gain control of it until end of turn. It gains haste until end of turn
-12: You get an emblem with "After your first combat phase on your turn, untap all creatures you control. There is an additional combat phase."