Warlord's Axe is a uncommon Artifact — Equipment card from Magic 2011 (M11), collector number 220. Current market price: $0.07 (foil $0.47), TCGplayer market prices via Scryfall.
Equipped creature gets +3/+1. Equip {4} ({4}: Attach to target creature you control. Equip only as a sorcery.)