Standard WU High End Control

Suggested changes:

-2x Heliod || -1x Fabled Hero || -1x Aetherling || -1x Brimaz || -2x Cyclonic Rift || - 3x Banishing Light || -2x Jace Memory Adept
+2x Elspeth, Sun's Champion || +4x Dissolve || +1x Sphinx's Revelation || +1x Syncopate || +3x Jace, Architect of Thought || +1x Temple of Enlightenment

Your sideboard is a little screwy, too. I don't like it at all for what you're going for.

-2x Murmuring Phantasm || -3x Arrest || -2x Revoke Existence
+1x Nyx-Fleece Ram || +2x Negate || +1x Last Breath || +2x Dispel || +1x Jace, Memory Adept

Explanation:

I see what you're going for and what you want out of your deck. The problem is you're looking to play control and currently have 0 counter spells, your control mirror will be terrible, and there's nothing you can do about it. The changes I've suggested bring you closer to your standard UW Control list but give you more versatility and leverage to not-die. There's a lot of things you just didn't have answers for and that's a serious problem.

So you get to keep your dudes here. All your little dudes. Since you're running 4x Banisher Priest you don't need 4x Banishing Light *and* 4x Detention Sphere so I cut the number down. Made room for Elspeth, better-Jace, and counter spells. I personally think you should run 3x Sphinx's Revelation because it's an amazing card.

Brimaz is legendary, you don't really want the full four. Three seems like a healthy number.

Syncopate rules.

Fabled Hero is just bad when you're never going to trigger heroic.

You never want more than one Aetherling. Ever.

Two Heliods seems bad as well. If anything I'd put him in the board but he just doesn't do anything for you. Cut for another land.

I've copied your list and I'm gonna link the way I'm suggesting you do it to you:

http://www.mtgvault.com/affykay/decks/uw-high-end-control-copy/