Kiyoshi, Master of Deals

While Kiyoshi, Master of Deals is on the
battlefield, vehicles you control cost {1} less to
cast and 1 less to crew.
{x},{t}: Close the Deal - During your attack phase,
put up to one vehicle from your hand onto the
battlefield tapped and attacking where X is the
vehicle's mana cost. At the end of combat, put
the vehicle under the control of the player who
it attacked then create X treasure tokens. At the
end of that players next turn, they must sacrifice
the vehicle.