Staff of Eden, Vault's Key is a mythic Legendary Artifact card from Assassin's Creed (ACR), collector number 76. Current market price: $2.49 (foil $3.06), TCGplayer market prices via Scryfall.
When Staff of Eden enters, put target legendary permanent card not named Staff of Eden, Vault's Key from a graveyard onto the battlefield under your control. {T}: Draw a card for each permanent you control but don't own.