Legacy Weapon is a rare Legendary Artifact card from Apocalypse (APC), collector number 137. Current market price: $0.81 (foil $32.19), TCGplayer market prices via Scryfall.
{W}{U}{B}{R}{G}: Exile target permanent. If Legacy Weapon would be put into a graveyard from anywhere, reveal Legacy Weapon and shuffle it into its owner's library instead.