Daybreak Coronet is a rare Enchantment — Aura card from Ultimate Masters (UMA), collector number 14. Current market price: $4.69 (foil $7.35), 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.)