Diviner's Lockbox is a uncommon Artifact card from Core Set 2020 (M20), collector number 225. Current market price: $0.08 (foil $0.05), TCGplayer market prices via Scryfall.
{1}, {T}: Choose a card name, then reveal the top card of your library. If that card has the chosen name, sacrifice this artifact and draw three cards. Activate only as a sorcery.