Fell Beast of Mordor

Fell Beast of Mordor

Creature - Drake Beast | Power/Toughness: 3 / 3 (CMC 4)
Flying
Devour 1 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with that many +1/+1 counters on it.)
Whenever Fell Beast of Mordor enters the battlefield or attacks, target opponent loses X life and you gain X life, where X is the number of +1/+1 counters on it.