Myrkul, Lord of Death

Deathtouch, menace
You may cast Myrkul from exile or from your graveyard as long as you control four or more Zombies and/or Liliana Planeswalkers.
Creature cards in your graveyard have unearth for {2}{b}. Whenever you unearth one of those creatures, it becomes a black Zombie in addition to its other colors and types.