Build for hard carry pusher naga. Usually you wanna go to safe lane with one or two support, and get your radiance up as soon as possible (reasonable timing is approx. 20 minutes). After you have it, you should focus on flashfarming with your illusions and get boots of travel. Then, you can start to really splitpush all lanes at the same time, grabbing tons of gold as well. Remember that your team should avoid teamfights, allowing you to slowly siege, damage towers and flashfarm.