Ozg'Sha, Vizier of Undeath

Deathtouch
Whenever another creature dies, amass 2. (Put
two +1/+1 counters on an Army you control. If you
don't control one, create a 0/0 black Zombie Army creature token first.)
Each Zombie card in your graveyard has unearth {u/b}{b/r}. ({u/b}{b/r}: Return the card to the battlefield.
The creature gains haste. Exile it at the beginning of
the next end step or if it would leave the battlefield.
Unearth only as a sorcery.)