Corpse Gulper

Devour 3
As long as Corpse Gulper has three or more +1/+1 counters on it, it has Deathtouch.
As long as Corpse Gulper has six or more +1/+1 counters on it, it has menace.
As long as Corpse Gulper has nine or more +1/+1 counters on it, it must be blocked if able and has trample.