Planet devourer

Plant devourer enters the battlefield with {x} plus 1 plus 1 counters on it. When planet devourer enters the battlefield put {x} devoured counters on up to {x} target creatures. (A creature with a devoured counter on it dies when it blocks and is blocked by planet devourer.)
If combat damage is dealt to planet devourer, at the end of combat bring planet devourer back to it's full health.
{t}{p/g}{p/g} Remove a plus 1 plus 1 counter from planet devourer. Put a devoured counter on target creature.