Grubritch, the Plague Paunch

Menace
When Grubritch enters the battlefield, put a
-1/-1 counter on up to to target creatures. If Grubritch deals combat damage to a player or is
the target of a spell an opponent controls, you
may put a -1/-1 counter on target creature.
As long as there are at least three creatures with a
-1/-1 counter, Grubritch has indestructible.