For the most part, this deck is pretty self explanatory, black has nice removal, blue has nice removal and control, mix them together and you get U/B control. I feel this deck can compete well in a competitive standard environment. Feel free to ask any questions in the comments or make any suggestions, I will look at them once I can. If you like what you see please feel free to +1 Upvote, it would be a big help.
Creatures: 4
Prognostic Sphinx - A 3/5 flying beater that can become hexproof and thin your hand if needed.
PlainsWalkers: 2
Ashiok, Nightmare Weaver - A strong plainswalker that can thin your opponents library with her +2, get you powerful creatures with her -X, and make your opponent quit with her -10.
Instants: 19
Bile Blight - Great removal card that can get rid of annoying creatures.
Dig Through Time - Great card that can help you draw into win-cons and lets you look at the top 7 cards of your deck.
Disdainful Stroke - Solid counter spell against cards like Dig Through Time or a big Crater's Claws etc.
Dissolve - Awesome counter spell that comes with scry. Need I say more?
Hero's Downfall - Awesome removal that can take out creatures and plains walkers.
Silence the Believers - Great removal that also takes of auras and comes with strive.
Sorcery: 8
Despise - Great card that allows you to see your opponents hand and choose a card to discard from it.
Drown in Sorrow - Great removal for creatures with low toughness and you get to scry.
Thoughtseize - Awesome hand hate.
Treasure Cruise - Almost the same as Dig Through Time but its not instant speed, you get to draw more cards, and it has a less restrictive mana cost.
Sideboard: 15
Clever Impersonator - Copy magic.
Murderous Cut - Great removal that has delve.
Negate - Good counter spell.
Pharika's Cure - Good removal and life gain.
Set Adrift - Nice card to mess up your opponents tempo + it has delve!
Pearl Lake Ancient - A great un-counterable beater.