Nimbus Naiad is a common Enchantment Creature — Nymph card from Theros (THS), collector number 56. Current market price: $0.07 (foil $0.27), TCGplayer market prices via Scryfall.
Bestow {4}{U} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached.) Flying Enchanted creature gets +2/+2 and has flying.