Arbok

Wrap - When Arbok enters the battlefield, choose target creature an opponent controls. Exile that creature until Arbok leaves the battlefield. At the beginning of your upkeep, that creature gains a -1/-1 counter. If that creature dies, you may choose one, where X equals the amount of -1/-1 counters on exiled creature.
Stockpile - Arbok gains X +1/+1 counters.
Spit - Arbok deals X damage to any target.
Swallow - You gain X life.