It seems to me that the tournaments are impossible. That is, of course, unless you have diamond dragons and hybrids. Well I'm on level 113 now and I still haven't got a diamond dragon, which means I also have no champions. Therefore I can't win any tournaments and I can't get any craftable dragons except that first Leviathan.
So those who are lucky enough to get diamond also get to have all the other nice new dragons. Those of us who can't get diamond however much we try are also banned from being able to use the battle arena to get dragons, making it useless. I understand making the final 8 or so dragons difficult to fight, but make it equal whether you have diamond or not. This is incredibly frustrating!