as the streamer Chu8 said and proved Nova is the #1 player killer hero
here is his channel
www.twitch.tv/chu8

I found a build on her and for the most part it worked well with my play style
but for player killing and sniping it needed tweaking

I added the rail gun talent that will allow you to snipe through creeps for more effective sniping

The fast reload for maximum killing power as when you kill with triple tap the skill is reset and there is no cool down this is very good for core pushing

I know this is not gonna be everyone's style but if you like sneaking around and from lane to lane assisting your team this will work well for you

as a rotation i start with an auto shot then more to snipe and then pin shot and the drop my decoy

i didn't add any threats as you should look to be weaving about from lane to lane so treat all as maximum threat :)