Conviction Dragon, Chromejailer Dragon

:[ 1 & Discard a "Conviction Dragon, Chromejailer Dragon" from hand], look at the same number of cards from the top of your deck as your open , choose any number of unit cards from among them, call them to , and shuffle your deck. :When this unit attacks, if all of your have rear-guards, [ 1 & 1], this unit gets +10000/ +1 until end of that battle, and if you have four or more cards in your damage zone, it gets drive +1.