Mortus, King of Traitors

Eminence - At the beginning of your upkeep, if
Mortus, King of Traitors is in the command zone
or in the battlefield, put a +1/+1 on a target
creature an opponent controls.
{w}{b}{g}, Remove all +1/+1 counters from target creature an opponent controls: Return a creature
from a graveyard to the battlefield under your
control with power less than or equal to the
amount of +1/+1 counters you removed.