Every persons island is different. My diamond dragon can't seem to hurt a butterfly. My divine is a much stronger fighter for me. There are color and type guidelines and then there are just the way your certain dragons are. Only time & practice will weed those out. Keeping good notes will help. From doing this I have found certain dragons who will ALWAYS take down a listed dragon. I've come to know which of these combos I can trust with my life so to speak. At least with my dragons lives. Once you get to know your dragons that's half the fight. good luck!