Aetherworks Marvel is a mythic Legendary Artifact card from Kaladesh (KLD), collector number 193. Current market price: $0.32 (foil $1.89), 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.