World Devourer Hydra

World Devourer Hydra enters the battlefield with X +1/+1 counters on it.
Annihilator X, where X is the number of +1/+1 counters on this creature.
When World Devourer Hydra dies, target opponent sacrifices X target permanents where X is the number of +1/+1 counters on World Devourer Hydra.