Sword of Forge and Frontier is a mythic Artifact — Equipment card from Phyrexia: All Will Be One Promos (PONE), collector number 244p. Current market price: $10.70 (foil $11.16), TCGplayer market prices via Scryfall.
Equipped creature gets +2/+2 and has protection from red and from green. Whenever equipped creature deals combat damage to a player, exile the top two cards of your library. You may play those cards this turn. You may play an additional land this turn. Equip {2}