Pros: Lots of AP
Easy to get kills
Fun to play

Cons: Easy to die
Need to play rather carefully
CC just kills you

I bring ignite and flash with me because ignite allows more DoT and flash lets me get up close for my ult. You can also bring clarity if you like to spam more but it's pretty useless mid-late game.

Basically, you start off with your "q" so you can harass the opponent and furthermore when you get your "w". When you start maxing out your "e" don't use it much so they won't know your damage output. By level 6-7 I go for the kill, flash and ult then "q" and "e" and have your "w" where the person will run because of the slow. You want to stay back during team fights unless you're going in to ult. Have your team soak up the damage while you deal 700+ damage with only your "q", and it has a 3 second cooldown! When chasing someone, try to land your "w" first then your "q" because you slow them down then gain 15% move speed to catch up.