Crystal Maiden? Ugh, again a support. Support makes no fun. Unless you combine support with Nuke and disturbing items for your victims! This build includes items to nuke down enemies with your ult easily, and if you combine it with supporting (which should be your job...) it gets a pain in the ass for the enemy team ;)
And if you really hate to support or your team allows you not to do, than there is an extra tab for cheap carry items^^ (Believe it, she can carry! Hard but painful.)