Gryff's Boon is a uncommon Enchantment — Aura card from Innistrad Remastered (INR), collector number 342. Current market price: $0.28 (foil $0.51), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +1/+0 and has flying. {3}{W}: Return this card from your graveyard to the battlefield attached to target creature. Activate only as a sorcery.