Magnifying Glass is a uncommon Artifact card from Shadows over Innistrad (SOI), collector number 258. Current market price: $0.10 (foil $0.21), 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.")