Visk, melancholy corruption

As long as a player a has a poison counter visk has hexproof from instants and sorceries and indestructible.

Creatures your opponents control with -1/-1 counters can't attack.

At the beginning of your upkeep and endstep put a counter on target creature an opponent controls that's the same type as a counter on another creature they control.

Infect menace devoid