Stormbeacon Blade is a uncommon Artifact — Equipment card from Tarkir: Dragonstorm (TDM), collector number 27. Current market price: $0.23 (foil $0.32), TCGplayer market prices via Scryfall.
Equipped creature gets +3/+0. Whenever equipped creature attacks, draw a card if you control three or more attacking creatures. Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)