they reduced the mana costs not too long ago. If she falls off late for you then you are building her wrong. build pure ap not cdr. could 1 shot any squishy no problem.
omg lux my new fave champ. Used to suck so hard with her before mana cost reductions, but maybe I just sucked back then...
mejai's OP on lux, throw out a shield on team and you are pretty much...