Call to Binem's Aid

Zombie creatures you control have +1/+1.
You may cast Human creatures from your
graveyard, they lose Human and become black
Zombies in addition to their other colors and
types and gain Persist.
Whenever you cast a creature from your
graveyard put a Grave counter on Call to Binem's
Aid. If there are 5 or more counters on Call to
Binem's Aid transform it into Vidad, Ghoulcaller
of Binem.