The first thing that sticks out to me is the milling cards you have in here. You don't have enough to win by decking your opponent out, and what you have is detracting from the rest of the deck. I would probably ditch all the stuff that says 'put cards from library into graveyard' in favor of more burn, and counter magic.
So that's what you take out, here's some stuff to put in:
Searing Spear - the best two mana burn spell in standard right now.
Dissipate - probably the best counter spell in standard right now.
Mizzium Mortars - good for either spot removal, or a one sided board wipe later in the game.
Unsummon - cheap guttersnipe trigger, and can bounce a creature so you can counter it later.
with all these added spells, I might also recommend adding Delver of Secrets, as he is Guttersnipe's best friend.
I hope that helps!