Go for trades when you have your Q at max stacks. Try to get the Blade of the Ruined King as fast as possible. If you are up against a Tank i recommend a Sunderer if you are fighting against a bruiser you should go Goredrinker or Shieldbow (depends on the Situation). If the opponents are Ap heavy you should buy wits end since it gives a whole bunch of Magic resist and good on hit damage. If you are up against a tank with high health regen you should buy Chempunk Chainsword, since it gives good Anti Heal, otherwise you deal no real damage (if they heal it all back), Dr.Mundo is a good example for that.