So, you picked / randomed Crystal Maiden and need a guide, that gives you a quick overview over all item choices you can have with her?
You have some mana-dependant heroes, like Dazzle, Tide, Storm Spirit, Doom, Luna, Shadow Shaman, etc? All those heroes who need some mana to wreck like crazy?
Then this guide might be the right for you!

Everything is explained when and why you should go for this item.