Twinblade Blessing is a uncommon Enchantment — Aura card from Foundations (FDN), collector number 26. Current market price: $0.28 (foil $0.36), TCGplayer market prices via Scryfall.
Flash (You may cast this spell any time you could cast an instant.) Enchant creature Enchanted creature has double strike. (It deals both first-strike and regular combat damage.)