Righteous Authority is a rare Enchantment — Aura card from Return to Ravnica (RTR), collector number 189. Current market price: $0.26 (foil $0.85), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +1/+1 for each card in its controller's hand. At the beginning of the draw step of enchanted creature's controller, that player draws an additional card.