Itemization suggestions
The thing I've noticed is that, for example, at mid lane Zed has a variety of items to compete vs burst mages - for instance,

. Yep, a lot of items
But not the other way around. The only defensive options against him are

(for mana champs)
Not much counter itemization.
Regarding items that give only AP and Armor (Or AD and Magic defense) we have
vs 
Not much counter itemization.
So I am suggesting a new item: Protection of the Skies(or whatever name first better in LoL
It builds from
60 armor
10% cooldown reduction
30 AP
passive: Dropping below 20% HP causes you to be shielded for your 30% max Health and 0.5x your AP.
Active: Consumes the cooldown of passive(if it is up), and shields you for ^ amount above.
If enemy attack would one shot you(Zed's ultimate mark proc), it places the shield instantly.
passive: has 20 more AP.
Also, the passive won't work if Armor > AP. I missed a possible flaw that that item would make Malphite OP as hell.