Leyline Axe is a rare Artifact — Equipment card from Foundations Promos (PFDN), collector number 129p. Current market price: $5.28 (foil $4.40), TCGplayer market prices via Scryfall.
If this card is in your opening hand, you may begin the game with it on the battlefield. Equipped creature gets +1/+1 and has double strike and trample. Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)