Forensic Gadgeteer (MKM) from Murders at Karlov Manor, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Volkan Baǵa
• Card Text:
  Whenever you cast an artifact spell, investigate. (Create a Clue token. It's an artifact with "2, Sacrifice this artifact: Draw a card.")
  Activated abilities of artifacts you control cost 1 less to activate. This effect can't reduce the mana in that cost to less than one mana.