I suggest you grind some more AI3 until you get all the hourglasses of that deck upgraded, then farm FG. Then, I build RoL/Hope and then I am currently saving for CCYB, which is pretty awesomely good. Twin's Butterfly deck is nice, but it has 3 purple nymphs, so I need one more. I think both of these stats are the same, but I still prefer CCYB.
Also, if you lose score when you start grinding FG, don't worry about the loss of scores. That was all that had when I started. That;s the only tip I can gladly give you.