Cogworker's Puzzleknot is a common Artifact card from Kaladesh (KLD), collector number 201. Current market price: $0.12 (foil $0.21), TCGplayer market prices via Scryfall.
When this artifact enters, create a 1/1 colorless Servo artifact creature token. {1}{W}, Sacrifice this artifact: Create a 1/1 colorless Servo artifact creature token.