Ancestral Blade is a common Artifact — Equipment card from Game Night: Free-for-All (GN3), collector number 6. Current market price: $0.09, 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.)