Thank you for the feedback!
Cutting the Mox Ruby for the green fetchland sounds great.
The SB Squee and SB Confidants were attempts at gaining some card advantage. I'm open to cutting them, but I think some recuperation/refill from Bazaars is still worthwhile. Also, card advantage seems worthwhile vs BUG. Do you have any recommendations on replacement cards? I have seen Deep Analysis in some lists...
I suppose Assassin's Trophy is indeed necessary since Deputy can't hit Tabernacle.
Thalia seems unimportant, don't worry about it? I'm afraid I don't follow. In addition to the problematic overlap with Lavinia (which makes for points AGAINST playing Thalia in the 75), Thalia is strong against blue decks where Lavinia is weak (points FOR Thalia). I heard Survival has a good matchup against BUG, is it intrinsically strong against most blue shells? If that's the case I could easily cut Thalia.