Sword of the Paruns is a rare Artifact — Equipment card from Commander 2013 (C13), collector number 264. Current market price: $2.20, TCGplayer market prices via Scryfall.
As long as equipped creature is tapped, tapped creatures you control get +2/+0. As long as equipped creature is untapped, untapped creatures you control get +0/+2. {3}: You may tap or untap equipped creature. Equip {3}