Magnifying Glass is a common Artifact card from Murders at Karlov Manor (MKM), collector number 255. Current market price: $0.21 (foil $0.28), TCGplayer market prices via Scryfall.
{T}: Add {C}. {4}, {T}: Investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this token: Draw a card.")