Hydra Brood Spawner

Hexproof, Flying, Deathtouch
When Hydra Brood Spawner leaves the battlefield, put three 2/2 blue and black hydra creature tokens onto the battlefield with "Flying, Deathtouch" and "When this creature leaves the battlefield, place three 1/1 black hydra creature tokens onto the battlefield with "Deathtouch".
That's a lot of mouths to feed...