Knightly Valor is a common Enchantment — Aura card from Return to Ravnica (RTR), collector number 13. Current market price: $0.09 (foil $0.35), TCGplayer market prices via Scryfall.
Enchant creature When this Aura enters, create a 2/2 white Knight creature token with vigilance. (Attacking doesn't cause it to tap.) Enchanted creature gets +2/+2 and has vigilance.