Sigiled Sword of Valeron is a rare Artifact — Equipment card from Core Set 2019 (M19), collector number 244. Current market price: $0.40 (foil $1.04), 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}