Phantom ASSASSIN is a great ganker and should start ganking immediately at level 6, therefore mid is best as you can realiably dagger creeps and hit level 6 early. At level 6 let someone else take mid lane and go gank, preferably focusing their carry. Crit and attack speed are built-in so all you need is health, damage, cleave, and magic immunity items. BKB is core and should be gotten as the first major item unless few stuns/magic nukes. Check-out the troll build for some fun when you are not try-harding