@sedio:
You should play more Jace TMS. The card is nuts.
If you have Affinity in your area, play Powder Keg over Ratchet Bomb. In either case, if you're playing mono-blue with no splash, I would play 4.
I don't like
Ancestral Vision. It's too slow. I prefer the draw engine of 4x Brainstorm (if you play fetchlands), 3x Jace, the Mind Sculptor, 2-3x Fact or Fiction. If you aren't playing fetchlands, I've had success with 4x
Impulse, 3x Jace TMS, 2-3x Fact or Fiction. My friend still stands by
Think Twice but I usually end up needing the Impulse to find a land because I never hit my fourth land (even with 24).
I would also run at least 23 lands, if not 24 or 25. MUC is mana hungry and needs to hit its first four, if not six, land drops.
I've never tested Capsize. For some reason, I feel
Repeal would be better. Repeal helps with the early game, where this deck is weakest. Capsize plays really strong late game, where this deck is the most powerful.
Force Spike is situationally amazing. However, I've had entire tournaments where I just wanted to tear the card in half. I wouldn't recommend running it. Spell Snare is better in nearly all situations.
If aggro decks are popular in your area, I can see Propaganda being main deck; if they're not prevalent, I'd just put it in the sideboard. It's dead (or close to it) in too many match-ups for me. I think I cut it from my 75 altogether.
Those are my suggestions.