Paladin of Atonement is a rare Creature — Vampire Knight card from Rivals of Ixalan (RIX), collector number 16. Current market price: $0.26 (foil $0.45), TCGplayer market prices via Scryfall.
At the beginning of each upkeep, if you lost life last turn, put a +1/+1 counter on this creature. When this creature dies, you gain life equal to its toughness.