Very DPS orienated build very good late game after Phantom Dancer you can get whatever but I tend to go for Manamune as it helps to have that damage/mana boost in the later stages but depending on what you see your opponents doing you can get other items that will help you out as well.

I reccomend having a friend with you to tank/draw fire as she will die fast if you over extend.

I tend to buy a lot of health/mana pots along the way to stay in battles longer and that helps a lot.