Sword of Feast and Famine is a special Artifact — Equipment card from Kaladesh Inventions (MPS), collector number 28. Current market price: — (foil $360.29), TCGplayer market prices via Scryfall.
Equipped creature gets +2/+2 and has protection from black and from green. Whenever equipped creature deals combat damage to a player, that player discards a card and you untap all lands you control. Equip {2}