Ancestral Blade is a common Artifact — Equipment card from Commander Legends (CMR), collector number 5. Current market price: $0.11 (foil $0.18), TCGplayer market prices via Scryfall.
When this Equipment enters, create a 1/1 white Soldier creature token, then attach this Equipment to it. Equipped creature gets +1/+1. Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)