Hydra Hero-Swallower

Hydra Hero-Swallower enters the battlefield with {x} +1+1 counters.
Whenever a creature dealt damage by Hydra Hero-Swallower dies, put a +1+1 counter on it.
Remove {x} +1+1 counters: Hydra Hero-Swallower deals damage equal to its power, divided as you choose, among up to {x} target creatures. Play this ability only once per turn, as a sorcery.