Mriz'Ir, Eternal Emperor

Creatures cards in your graveyard has eternalize.
Its eternalize cost becomes equal to four
differents colored mana.
Whenever a Zombie creature token enters
the battlefield, put a +1/+1 counter on
Mriz'Ir, Eternal Emperor and draw a card.
"There are more to be an emperor of a undead
kingdom than a living kingdom... Undead can't die eternally and living come in our army."