It absolutely is not an exploit. It has been a long practiced and perfectly legal practice in the eyes of blizzard. All the combat is done on the server side, only the animations are on our side. The server already knows who won or lost or tied in the combat round the moment the round began showing the animations for us on our side. All the disconnect does is stop the long animations from subtracting from your build phase, which is what the builds with many a deathrattles and reborns and summons are meant to do. Not just defeat you in the general rounds but also to deprive you of your turns to be able to do anything to adapt. Taking back your actual turn time to get around such tactics has always been legal and not an action that can get you banned. you dont know what you are talking about.