Grakmaw, Skyclave Ravager [Zendikar Rising]

Description

Set:	Zendikar Rising
Type:	Legendary Creature — Hydra Horror
Rarity:	Rare
Cost:	{1}{B}{G}

Grakmaw, Skyclave Ravager enters the battlefield with three +1/+1 counters on it.
Whenever another creature you control dies, if it had a +1/+1 counter on it, put a +1/+1 counter on Grakmaw.
When Grakmaw dies, create an X/X black and green Hydra creature token, where X is the number of +1/+1 counters on Grakmaw.