Highlander Mage

First off, this deck does NOT include Conjurer's Calling or Mountain Giant. You're free to shift cards around if you wish, but I would rather focus on removal cards than board control personally.

Cards like Blizzard, Flamestrike, Reno the Relicologist, Shooting Star, Magic Dart Frog, and Arcane Missiles are the most obvious removal cards in the deck. Important tip to note: Frost Nova combos well with Ray of Frost. It's a (5) mana deal 4 damage that freezes the enemy's entire board. Zephrys the Great is also a great option if you don't have any of the previously mentioned cards and need the "perfect" card in a sticky situation. 

The secrets are picked to be as control-oriented as possible, with Vaporize and Flame Ward providing two forms of removal. Ice Barrier is in the deck to give some sustainability. These obviously pair well with Arcane Flakmage and Kirin Tor Mage. 

I shouldn't have to explain Arcane Intellect, Frostbolt, Acolyte of Pain, Zilliax, SN1P-SN4P, or Fireball.

Messenger Raven and Dune Sculptor are supposed to give you more minions to play if needed.

Bone Wraith, Rotten Applebaum, and Khartut Defender give more sustainability through taunt, healing, and sticky reborn.

Alexstrasza is a decent card to "heal" yourself back to 15 or put a decent amount of pressure on your opponent; only a niche card in this deck. 

Siamat is just a great all around card with the flexibility it brings to play. It can provide sustainability, removal, or plain raw damage.

Last but not least is my explanation of Pyroblast and Sunreaver Warmage. Many games may end with the use of an unexpected Pyroblast. Sunreaver Warmage is best used while any spell of (5) cost or more is also in hand, as it provides decent removal in the mid-game. 

That should be it for this deck, feel free to leave questions and comments below!