This is only a build with item explanations.

We start with regrow pendant and a heal pot that u can spam your e to have a shield.

First going back Giants and shoes.

2nd going back warmogs

Now you can farm and build your shoes (Mercurys or Sorcerer) and lich bane.
I chose lich bane because u can push towers very easy and your q spell deals amazing dmg.

Rabadons to farm much faster and deal more dmg.

Now you can choose if you take more m dmg, phys dmg or the enemies just suck.

M res : Force of Nature and Abyssal Scepter

Phys res : Thornmail and Sunfire cape

or : Rylai's and Hextech

I hope you'll test my build and thump up.

If u have questions pm me here.

Ps:
I'm german hope u understand what i wanna say.