Valkyrie's Sword is a uncommon Artifact — Equipment card from Kaldheim (KHM), collector number 36. Current market price: $0.22 (foil $0.27), TCGplayer market prices via Scryfall.
When this Equipment enters, you may pay {4}{W}. If you do, create a 4/4 white Angel Warrior creature token with flying and vigilance, then attach this Equipment to it. Equipped creature gets +2/+1. Equip {3}