Favor of the Overbeing is a common Enchantment — Aura card from Eventide (EVE), collector number 151. Current market price: $0.39 (foil $22.35), TCGplayer market prices via Scryfall.
Enchant creature As long as enchanted creature is green, it gets +1/+1 and has vigilance. As long as enchanted creature is blue, it gets +1/+1 and has flying.