UW Control

I'm always hesitant about running sphinx's revelation because it eats up the turn you play it which leaves you vulnerable. On top of that, you have to play it late game to get anything out of it which means if you draw it opening hand or middle game its basically a dead draw. Keeping that reasoning in mind, I would limit it to 1 copy per deck to basically ensure that you won't be getting it opening hand very much. Personally, I would rather run tidings as a draw source as it will be cheaper for better card advantage and can be played in the middle game instead of sitting in your hand as a brick until the end game. With revelation, you will have to spend 7 mana to draw 4 cards, and you will only gain an extra 4 life, which really doesn't help that much when compared with the extra mana you have to spend.

I'm also concerned about running 4 snapcasters as you don't really have that many targets for them which makes them dead draws until the end game. You wont be casting them for revelation, so you only have 7 instants and the supreme verdicts as targets, so I think running 4 snapcasters is a bad idea. It would be better to trim it down to 3 and run another instant control element to up the chances of the mage hitting and hitting hard.

Spreading seas doesn't really fit in here as you are only running a 2 color deck and aren't looking for any islandwalk damage, so I can only assume you are using it for acceleration and slightly better mana base. Serum vision would be a much better bet as it can be played turn 1, gives better card advantage, and as a last resort can be an outlet for snapcaster when you have nothing else at your disposal.

I would also consider knocking the lands down to 22 with the above mentioned changes as you will have a pretty low curve and have no need for excess mana which will help the deck be more consistent and not get bogged down late game with top decked useless lands.

Just some thoughts.