Zon, Lich of Revolution

Wither, Persist
{r}: This creature gets +1/+0 until end of turn.
{b}{r}{r}: Gain control of target creature with a
-1/-1 counter, as long as it has a -1/-1 counter.
Each creature you control has, At the beginning
of your upkeep remove a -1/-1 counter from this creature.