Vecna, the Whispered One

Flying

When Vecna enters, if you cast him, create an artifact token named Vecna's Phylactery.

Zombie spells you cast have convoke. Whenever a zombie enters under your control, if it was convoked, create a 2/2 blue, black and red zombie creature token.

{u}{b}{r}, sacrifice five other creatures: Exile Vecna, then return him transformed under your control. Activate only
as a sorcery