Righteous Valkyrie is a rare Creature — Angel Cleric card from Foundations Commander (FDC), collector number 43. Current market price: $1.68, 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.