Managorger Hydra

Whenever a player casts a green spell, put a +1/+1 counter on this creature.

Whenever you cast a noncreature spell, put a +1/+1 counter on this creature.

Trample

Whenever you cast a spell with mana value 5 or greater, put a +1/+1 counter on this creature.

Trample

Whenever you cast a spell with mana value 4 or greater, put a +1/+1 counter on this creature.

Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature.

Trample

Whenever this creature deals combat damage to a player, put a +1/+1 counter on it.