Improvise (Each artifact you tap after you're done activating mana abilities pays for 1.)
Reveal the top X cards of your library. You may put any number of artifact cards with converted mana cost X or less from among them onto the battlefield. Then put all cards revealed this way that weren't put onto the battlefield into your graveyard.
Illus. Craig J. Spearing
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KHANS OF TARKIR 
COMMANDER 2014
FTV: ANNIHILATION 
SPEED vs CUNNING 
MAGIC 2015 
CONSPIRACY 
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