Few things to point out with Lux, I find her more of a long range mage, she doesn't need the spell vamp, and the only reason to get will of ancients is if she has alot of ap user allies. I also feel like getting meji's so early is not that cost effective. It only gives you 20 ap, and you have to be rolling in kills for it to be good early game. Also your mana base is relatively small by the time you get mejis, maybe 1000 mana and can be burned through rather fast. especially since the build seems to suggest that you are going to be using all 4 spells. the build it self is awesome late game. It is quite supportive for an ap based team. Definitely on your next guide add some more details on how to play game stages for those completely new players. I like it though +1 for the support/mage idea.