ECQ Deck: Xenan Midrange

Unfortunately I had some connection problems early in the day and only managed to play 21 games of the ECQ, going 11-10 with this list.
I arrived at this list after pretty extensive laddering with the Team Rankstar Xenan list. I am mostly happy with my changes. My reasoning for some of these:
I found that my wins over opposing midrange decks usually involved recurring killer units. So I decided to load up on Xenan Initiation and Dark Return, cards I never felt I had enough of. I was also pretty underwhelmed by Amaran Stinger, which was solid when it connected on 3 and mere board gunk otherwise. So I decided to bring in Ripknife Assassin and Auric Interrogator, which synergize well with the Initiations.
I moved The Praxis Arcanum to the market because it's the weakest site in the deck and sits in a crowded spot on the curve. Here I use it as something for Ebon Dune Smuggler to get early if I have no obvious needs. Also In the market I cut Stray into Shadow because I never once played it - 5 power is just too expensive. I went for Passage of Eons to combat Combrei stacking relics - mixed results on this one. 6 power is also a lot. Auralian Cargo because sometimes you just need a sigil.
I honestly have mixed feelings about Teacher of Humility. She ends some games before they even start, but is terribly disappointing late. Temple Scribe is less flashy but might be more helpful.