This build will make ur Q and W hurt like a bitch, and ur autoattacks in between spellcasts or during cooldowns will still hurt for a shit load for a mage. Nobody seems to use autoattacks on mages too often, so people wont expect a 300 damage auto attack from tanky ass ryze followed by a 700 damage Q.

The question you may be asking about the build is the muramana. You may be asking why the fuck i recomend it, its a simple answer. It makes ur single target abilites (Q & W & Autoattacks) do bonus damage that stacks off of mana, which is what ur getting an ass ton off. The Sheen will give ur auto attacks more damage but the iceborn gauntlent gives more mana, armor and an AoE on ur auto attacks so its up to you.
Get boots whenever you want, tier 2 boots i feel shouldn't be bought till later since movement speed was nerfed and so was flat Mpen and get furor as the enhancement so u can catch the running scaredy cat bitches and rape them with a darius ult.