Lv4-5 Dragon in war CC's is now a very common encounter at war. They can be tricky to deal with if you dont space out your troops correctly. Here is a video showcasing an efficient way to kill a CC dragon.
One other effective way to deal with CC dragon is to lure and drop CC witches in a corner, backed up by wiz+barbs. Skellies/barbs should cause enough distraction to the drag for your wiz to take it out.