Re: What is Naga Siren's Item build?
When I pub with Naga, I go wand first, then boots and cloak of the magi on side lane.
Magi gives me enough mana usually, so I finish diffusal, go treads, then manta, then HoT. By then it's usually gg one way or the other, but I'll go BoT next. If I'm up against another hard carry, I'll get butterfly, and maybe vlads by the very end.
Going to diffusal2 immediately sounds interesting, I might try that next time, though I go through purge charges pretty quick.
Edit: and don't get buriza, it's +dmg, which doesn't transfer to illusions. Can't say I've had much use for mkb either. You just want to get diffusal, then stack stats (and manta of course). Speed is a good idea too, since you're not the tank, you want to get in as fast as possible, do as much damage as possible, then get out if necessary. If you can do that without using sleep, so much the better.