Torrential Gearhulk is a special Artifact Creature — Construct card from Kaladesh Inventions (MPS), collector number 2. Current market price: — (foil $56.38), TCGplayer market prices via Scryfall.
Flash When this creature enters, you may cast target instant card from your graveyard without paying its mana cost. If that spell would be put into your graveyard, exile it instead.