You should change Seasoned Marksman for Power Throw at level 1. The rest of you build is not based on Auto Attacks, so why take Seasoned Marksman?
For the same reason i also think that Epic Mount is better then Nexus Frenzy at level 20.

In my opinion you either go full auto-attack Falstad or you go Mage Falstad. The Hybrid builds are just not good enough.

I get your point but as an assassin your job is to help your team by bursting down enemy threats. As a healer, you want high healing. As an assassin, you want high hero damage.

I do not aim for high damage output for my own fame, I do it for my team. Offense is often the best defense! :)

That's what annoys me lately. So many people going for their own fame instead of playing for the team :(