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}: 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. At the end of that players next turn,
they must sacrifice the vehicle.