The goal of this deck is to beat aggro by being a little more control, and beat control by being more tempo. It works very well against rakano, cultists, and all the spell-craft shenanigan decks.
Yes, sunset stone and hexweaver counter each other, but against any permafrosts it is incredible. It can also make a surprise lethal with the skystrider.
Toughest matchups include sediti decks, and time justice decks.
I play a standard version with 4 Sunset Stone and Vishni (without Livia, for the reason you comment), but I'm looking forward to trying your version!