Sword of Sinew and Steel is a mythic Artifact — Equipment card from Modern Horizons (MH1), collector number 228. Current market price: $10.40 (foil $22.62), TCGplayer market prices via Scryfall.
Equipped creature gets +2/+2 and has protection from black and from red. Whenever equipped creature deals combat damage to a player, destroy up to one target planeswalker and up to one target artifact. Equip {2}