Pennon Blade is a uncommon Artifact — Equipment card from Commander Legends (CMR), collector number 329. Current market price: $0.23 (foil $0.25), TCGplayer market prices via Scryfall.
Equipped creature gets +1/+1 for each creature you control. Equip {4} ({4}: Attach to target creature you control. Equip only as a sorcery.)