Zaroth, life stealer

Deathtouch, first strike, lifelink
Zaroth, life stealer enters the battlefield with twice X +1 +1 counters on it.
When Zaroth, life stealer enters the battlefield, destroy up to X target creatures.
Creatures your opponents control get -1 -1.
Whenever Zaroth, life stealer destroys a creature, you gain up to 4 life.