Righteous Valkyrie is a rare Creature — Angel Cleric card from Foundations Jumpstart (J25), collector number 246. Current market price: $5.15, 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.