Righteous Valkyrie is a rare Creature — Angel Cleric card from Kaldheim (KHM), collector number 338. Current market price: $9.74 (foil $12.74), TCGplayer market prices via Scryfall.
Flying Whenever another Angel or Cleric you control enters, you gain life equal to that creature's toughness. As long as you have at least 7 life more than your starting life total, creatures you control get +2/+2.