Until end of turn, whenever a Vampire enters the battlefield, if a black permanent is on the battlefield, Zombies you control get +2/+2 until end of combat.
Mire Seagraf {BB} |Sorcery| Until end of turn, whenever a Vampire enters the battlefield, if a black permanent is on the battlefield, Zombies you control get +2/+2 until end of combat. / Green Spirits get -7/-8 until end of turn.