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I'd scrap Dispel and maybe even Spell Pierce , they aren't really that great unless you know what deck you'll be playing against.

Sphinx of Jwar Isle is loads better than Mahamoti Djinn , blue actually gets good creatures these days.

I'd play Into the Roil over Unsummon , being able to use it to draw cards late in the game is very useful, and it can bounce things besides creatures. If you just want a creature bounce spell then you should probably play Silent Departure , since you can flash it back later.

Sapphire Medallion or Everflowing Chalice would be good. You can play them with three Island out and still leave up a Mana Leak or Miscalculation .

Your deck could really use some Preordain too, it's one of the best filter spells in the game, and better than Brainstorm and Ponder usually when you don't have any fetchlands.

You'll want some card draw. Think Twice or Fact or Fiction would probably be best.

You might want to consider Cloud of Faeries and Spellstutter Sprite .

Narcolepsy gives you a way to deal with resolved threats. There's also Curse of Chains . Edit: Actually Psionic Blast might be best because it is instant speed.

Edit 2: And this deck could really use Dismiss .

I didn't realize Sapphire Madallion was expensive, I thought it was chaff that nobody played. Fact or Fiction isn't too expensive though, about a $1 each I think, though I'm not sure what your budget is.

With the amount of Island and counterspells you have I think Spire Golem is going to be better than Fettergeist . At worst it is a Fettergeist with one less power, but at best it is cheap or even free creature that allows you to hold up counters. Delver of Secrets is also incredibly potent in your deck, since it is almost exclusively instants.

You might not want to be running so many Gitaxian Probe , if you get a hand with two Probes and a Psionic Blast that's pretty bad against an aggro deck.

When I contemplated the delver of secrets I just saw it getting spot removed so easily w/ burn or B/W removal

They HAVE to kill Delver or it will win you the game. It's such an awesome critter for control.

I personally think 20 lands for control is too low - going up to 22-24 would be better. Also some Man Lands is good for control decks.

I'm not really a fan of Psionic in here - it doesn't feel right/ I'd replace it with either more board control, or better draw.