This is my very first build so please dont rate to harshly. This build i find is very good. The three bloodthirsters provide alot of damage and lifesteal.

first of all go straight for beserkers greaves for bonus attack speed and moverment speed. Then get avarice blade for extra gold and to start your crit chance up. Infinity edge for damage and off course more crit chance and its passive. phantom dancer for even more crit chance and att speed. Blood thirster x3 for damage and life steal. To get the third blood thirster sell your avarice blade, tryndameres passive deals with the crit chance. Finally sell your beserkers greaves for another phantom dancer it makes up for not having any boots due to the two of their movement speed. The extra attack speed helps alot.

Pros:
High damage output (over 1000)
Epic champion destroyer

Cons:
slightly squishy (life steal makes up for this(if you get stunned your stuffed))