The problem of an AP facing an AD in mid is because the AD starts with 80~90 Attack Damage while the AP starts with 50. One autoattack is basically 30 damage difference. And they still have better base armor, and they have 100hp more than an AP.

"oh the has abilities to use his ap."

yeah, and AD has his abilities to use his AD.

The problem here is that Attack Damage runes gives too much Attack Damage early on. It is too much cost effective.

15 AD. You do 3 autoattacks = 45 more damage. 45 more damage is too much. seriously think about it before downvoting me.

I think this would be a better way of doing it:

Chain Vest: +45 armor
Builds out of: Cloth Armor (+15 armor; 300g) x 2
Cost: 600 + 120 combine cost = 720g

Zhonya's Hourglass
Needlessly Large Rod: +80 AP (1600)
Chain Vest: +45 armor
Amplifying Tome: +20 AP (435)

+120 AP, +50 Armor
Cost: 2755 + 445 combine cost = 3200g

ok if you start dorans or amp tome in mid then i can stop reading this post cause im having a hard time taking you serious. But you should really think about this: if you have more damage, but can never use your damage because you have no sustain and will maybe not win a trade, what is wrong with buying some defense and sustain, so you can actually use your damage? Especially as ap mid, your early damage is primarily being increased by levels, not by AP. If you can actually stay in the lane better, you have more damage

I can't really see this being a good item due to an AP champion being mid and not usually needing armor. I can see a jungle may need this but they have Spirit of the Lizard for it instead of this.

I think this could be a better item, just reduce the cost and add it onto Zhonya's like the guy above me said.

You do realize this is for when ap mids are up Against ad mids right? And no jungler takes lizard anyway