Tonight's the Night

At the beginning of each end step, if an opponent lost 2 or more life this turn, you may put a quest counter on Tonight's the Night.

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

...And it's gonna happen again and again. Has to happen