Build your "Sniper" on middle ( and hard gank with mask of madnes )
You must be farmed "Wraith Band, Power Treads" before 5 min, until 15 minutes, you should to farm "Mask of Madness, Crystalys". (You must kill -\+ 50 Creeps and you already gank's on line)
If you want, you can compile "Shadow blade", which will help you avoid undesirable battles.
GL & HF !
Press "rate" if u like this build