Aetherworks Marvel is a mythic Legendary Artifact card from Kaladesh Promos (PKLD), collector number 193s. Current market price: — (foil $6.62), TCGplayer market prices via Scryfall.
Whenever a permanent you control is put into a graveyard, you get {E} (an energy counter). {T}, Pay six {E}: Look at the top six cards of your library. You may cast a spell from among them without paying its mana cost. Put the rest on the bottom of your library in a random order.