I find you need to get magic penetration marks ap quints glyphs and mana regen seals to maximize damage output

The build i put is my standard build if u feel like you arent putting out maximum damage and getting shut down you could switch will of ancients with zhonyas hourglass and switch boots to merc treads

PROS CONS

1. Real good damage out put 1 neeeds to time playful trickster
2 dodge almost all spells (including karthus ult) to dodge
3 good initiate with ult (slow plus knockup) 2 cc's hardcore shut him down
4 good ap ratios

e can dodge almost dodge any spell