His latest buff has been amazing to him, I haven't lost one game and even got a quadra kill with him.
You still build him as a tanky mage as before. My typical build as follows
Force of Nature
either a Abyssal Scepter (if there are a lot of mages giving me problems) or Randuins Omen (for meele dps)
Finish with Guardian Angel.
Farm. Always be farming, unless theres a 5 man push down in mid, ignore it. You can carry games very easily if you can get items in such a short period of time. Always max out E as follows, then W, Q, and your R whenever it's up. HARRASS. I find he does amazing harassment now these days, it's key into shutting down a lane.
edit: pic couldn't be smaller ><