Ledger of Corrupt Contrivance

Whenever you attack with a creature you get {e}. If that creature was an artifact creature you get {e}{e} instead.
Pay {e}{e}{e}{e}{e}{e}{e}{e}{e}{e}: Search your library for a card and put it in your hand. If that card is an artifact, until end of turn you may cast it without paying it's mana cost. Then shuffle your library.