Daybreak Coronet is a rare Enchantment — Aura card from Modern Masters 2015 (MM2), collector number 14. Current market price: $4.51 (foil $6.66), TCGplayer market prices via Scryfall.
Enchant creature with another Aura attached to it Enchanted creature gets +3/+3 and has first strike, vigilance, and lifelink. (Damage dealt by the creature also causes its controller to gain that much life.)