Activate the Machinations

Entrap the bottom card of your library. (Put the card onto the battlefield face down as a colorless 0/1 Mine artifact creature token with defender and "When this creature dies, instead flip the card and cast without paying its mana cost. All players cannot peek under the entrapped card.)
Metalcraft- Then, if you control three or more artifacts, all Mine artifact creature tokens you control gain +1/-1 until end of turn.