Wendigo

Haste, First Strike
Whenever Wendigo kills a creature, put two +1/+1 counters on it.
If Wendigo has two +1/+1 counters on it, it gains vigilance.
If Wendigo has four +1/+1 counters on it, it gains shroud.
If Wendigo has six +1/+1 counters on it, it gains lifelink.