Sigiled Sword of Valeron is a rare Artifact — Equipment card from March of the Machine Commander (MOC), collector number 377. Current market price: $0.40, TCGplayer market prices via Scryfall.
Equipped creature gets +2/+0, has vigilance, and is a Knight in addition to its other types. Whenever equipped creature attacks, create a 2/2 white Knight creature token with vigilance that's attacking. Equip {3}