Bloodchief Ascension is a mythic Enchantment card from Avatar: The Last Airbender Eternal (TLE), collector number 23. Current market price: $14.49 (foil $15.58), TCGplayer market prices via Scryfall.
At the beginning of each end step, if an opponent lost 2 or more life this turn, you may put a quest counter on this enchantment. (Damage causes loss of life.) Whenever a card is put into an opponent's graveyard from anywhere, if this enchantment has three or more quest counters on it, you may have that player lose 2 life. If you do, you gain 2 life.