Legendary Planeswalker — Liliana
+1 : Create a 2/2 black Zombie creature token. Mill two cards.
−3 : Return target creature card from your graveyard to the battlefield. That creature is a black Zombie in addition to its other colors and types.
−7 : Destroy all non-Zombie creatures.
A creature that is a Zombie and has other types, such as a Zombie Jackal, isn't a non-Zombie creature.