Bloodchief Ascension

At the beginning of each end step, if an opponent
lost 2 or more life this turn, you may put a quest
counter on Bloodchief Ascension. (Damage causes
loss of life.)

Whenever a card is put into an opponent's
graveyard from anywhere, if Bloodchief Ascension
has three or more quest counters on it, you may
have that player lose 2 life. If you do, you gain
2 life.