Eliza, Grixis Necrosage

Zombies, Skeletons, and Shades get +1/+1
Sacrifice a creature: Each player puts cards equal to half the sacrificed creature's power, rounded down, into their graveyard.
{u}{b}{r}, Sacrifice two Zombies, Skeletons, and/or Shades: Return target creature from a graveyard to play under your control, that creature is a Zombie in addition to it's other types. Activate this ability only as a sorcery.