Thirsty Stickbeast

Vigilance.
Famished (At the beginning your upkeep, if this
creature did not deal combat damage or enter the
battlefield since you last upkeep, put a -1/-1 counter
on it. )
Whenever a Forest or Swamp enters play, you
may remove a -1/1 counter from Thirsty
Stickbeast.
A guard beast that will feed on the blood of
your enemies does not empty tour larder.