Grave Wizard

+2: Zombies you control get +2+2 and gain deathtouch until end of turn.
-4: Put a +1+1 counter on each zombie you control they gain deathtouch, double strike and haste until end of turn
-7: Search your library and/or graveyard for any number of zombies and put them on to the battlefield they gain haste until end of turn. Proliferate