I wouldn't call Ryze squishy...;p

And replacing Rabadon's Deathcap with Banshee's Veil makes him even more tankier.

For the current Ryze who scales off much better with mana then ap, Rabadon's Deathcap isn't the best choice on him anymore. Otherwise the rest of the guide is ok I guess. +1

Good items, like detaild , you could add pictures or smth

I would not recomend going towards the AP side for Ryze, especially when he has bad scaling in AP. I would prefer to build him tanky Mana-based, since he has a truckload of survivalbility building pure mana and tank items (With exception of Rod of Ages and archangel staff).

However, your guide is generally good. +1 :)