Detective's Satchel is a uncommon Artifact card from Murders at Karlov Manor (MKM), collector number 196. Current market price: $0.25 (foil $0.22), TCGplayer market prices via Scryfall.
When this artifact enters, investigate twice. (To investigate, create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.") {T}: Create a 1/1 colorless Thopter artifact creature token with flying. Activate only if you've sacrificed an artifact this turn.