Phyrexian Tower is interesting Tech. If you want to up your Blue count, could consider Daze adding Daze, as replaying the Island will give you another Landfall trigger. Staying within budget I don't think that a Vampiric Tutor is too expensive, but I think that it might be a bit better then Consultation.
Sideboard since your non-proxy which usually means a fair amount of Aggro, Massacre is great.
Cards to cut is a hard question, might go to 3 Duress since you do have 3 Cabal Therapy.
You're right about vampiric vs consultation. I always play aggro and regard consultation very highly, but in this deck, it's drawback is actually substantial.
I'll keep massacre in mind. Yes, the deck needs some kind of answer to aggro.
Cabal therapy isn't as good a first turn play as duress, except for in a few match-ups (oath being the most obvious I can think of). In this deck in particular, I would also need some luck to follow up with a flashback turn two, which leads me to believe that the third therapy is the weakest of my discard spells. If I find that seven 1cc discard is a bit much, I'll probably cut a therapy.
Thank you!
EDIT: Hydr34: You might notice that I'm not asking for anti-ichorid sideboard help. Simply because ichorid isn't an issue in my meta (people don't own bazaars where I live).
Graveyard strategies do pop up though, and something like dragon may cause people to load up on gy hate, which
would kick me in the nuts. What I think about it? This deck is vulnerable to graveyard hate during certain windows of time. I can either try to play around it or lean more heavily on less-affected parts of the deck (tendrils). Either approach could get some help from the sideboard, but I have the time to watch what gy hate people lean towards using and build accordingly.
However: If I was to take this to a meta where more than half the decks played 4 leylines and either crypt or jailer, I'd probably play echoing truth (2 main, 2 side) over repeal. Whenever I thought such a package would be boarded in against me (after loosing to it game 2 or similar), I could board out 4 intuition, 1 demigod, 1 clamp for 2 truth and 4 dark confidant. That would slow the deck down substantially, but give it yet another draw engine to fuel harcdasted demigod or tendrils, while the opponent would be relying on dead cards. Does that sound ok?