Nylea's Huntmaster is a common Creature — Centaur Shaman card from Theros Beyond Death (THB), collector number 187. Current market price: $0.08 (foil $0.31), TCGplayer market prices via Scryfall.
When this creature enters, target creature you control gets +X/+0 until end of turn, where X is your devotion to green. (Each {G} in the mana costs of permanents you control counts toward your devotion to green.)