I really like your guide, but wanted to ask if you have tried Water Dragon since they buffed the damage and reduced the mana cost? I have found it to be better at keeping people alive than the Jug of 1000 Cups. Especially since using the Jug makes it to where you can't use your blind or single heal, where Water Dragon will cast even if silenced, stunned, or eaten by Zagara, etc. With going Mass Vortex and Surging Winds, the healing and damage I pump out is amazing and able to do wonders...

I would like to point out something that I have noticed with Tracer's talents for when you do your breakdown. Her Ricochet talent at lvl 13 will reveal Stealth characters quite reliably (Prioritizes Heroes even when stealthed in range). Very useful since she has no real skillshots other than her Heroic to be able to reveal them. My friend was on Nova and found this out the hard way. May help with your issues with Zeratul some.

A couple notes about your guide: Lvl 1 talent is for Mercs, not Minions. It's the damage buff of most Merc Lord talents without the damage reduction. Lvl 7 talent Possession is instant kill to minion, plus create your own minion to replace it, vs bonus damage on withering fire only helps to kill and if there is a hero nearby, you can't target the minions anyway. No benefit to hero fighting at all, where Possession can make the enemy very much outnumbered by minions and have to run or let...

Just wondering if you have had a chance to try out that build and what your thoughts were if you had.

With the latest buff to Nova, I find the combo of One in the Chamber with Perfect Shot to be insane damage. I pick up Rapid Projection and Psionic Efficiency to compliment it both for more One in the Chamber hits and for the huge increase in mana usage at lvl 16. Other talents are pretty much optional choices imo, though.