Try to use you to q to deal dmg to enemy midlaner and when you get 6 kill just do e w q aa ignite ult combo to get free 9 ap and kill. Try to play defensive until lv 6.

Here's why i build what i build. First you will get easy 45% cooldown reduction. zhonya give 10% nashor tooth 20% ,lich bane 10% and 5% from your masteries. Second you will deal tons of dmg. let's do quick math. if you have 1000 ap (with zhonya , lich bane,nashor tooth, luden's echo) you will deal 200 ap dmg from ludens echo , 165 ap dmg from nashor tooth and 500 ap dmg from lich bane. it's a lot! third faster and esier stack farming. you play the game for 20 minutes so you have zhonya and nashor tooth and something like 70 - 150 stacks (less ro more) and you must aa minion 2 - 4 times to kill with your q a minion. but with nashor tooth it takes only 1 max 2 aa to have minion with that enough health to kill with you q.forth you are more usefull in teamfights. 1200 ap with my build is better than 1600 with typical build bc when tf start with normal build you will kill max 2 enemys and you will die but with my build you can save 1 or sometimes 2 spells which is a lot!

Pros:
Stupidly high dmg
Low ban and pick rate
Easy to play
Most of items build (ap) works
Don't get bored when you play him a lot
People on lower ranks don't know how to play vs him
Good zoning
Medium level of skill mastering
Good roming potential
Can be played on mid and support
Not bad ranges
Very low cooldown in late
Cons:
No mobility
Easy to counter with magic resists in early
High cooldown in early
Easy to ganked
Not that low mana costs in early
Don't have good base tank stats
Don't have good base hp
When you dodge his spells his ult is usless(with my build you only need to q{you can miss} and just aa + ult to kill adc)
When he is behind he is good only at zoning