Inventor's Axe is a common Artifact — Equipment card from Modern Horizons 3 (MH3), collector number 126. Current market price: $0.18 (foil $0.29), TCGplayer market prices via Scryfall.
Flash When this Equipment enters, you get {E}{E} (two energy counters). When this Equipment enters, attach it to target creature you control. Equipped creature gets +2/+0. Equip—Pay {E}{E}.