Melissa, Unbound Witch

+2: Create a token that's a copy of a creature card in a graveyard. That token is a black zombie in addition to its other types and colours.
+1: Until your next turn, if a creature would attack you or a planeswalker you control, that creature gets -6/-6 until end of turn.
-12: Destroy all creatures your opponents control. Put all permanents from all graveyards onto the battlefield under your control.