This is an adaptation of the Witchwood Elemental Mage. The deck has three avenues to victory:
First, you can get off to a quick start with Book of Specters into Mountain Giant on turn three or four. Or otherwise, if you manage to get ahead on board in the early game, compund the issue with elemental synergy (damage and draw effects, mostly).
Secondly, you can win the long game with Frost Lich Jaina. As opposed to Big Spell Mage, which relies heavily on the opponent playing minions for her to turn into Water Elementals, this deck can churn out life stealing elementals proactively after turning into DK.
Thirdly, I've put in a package built around Luna's Pocket Galaxy, with Grand Archivist for potential high roll (getting draw three off the Archivist is no disaster, either), and a few high cost minions to take advantage of the effect. The thought is not to build the deck too reliant on this effect though, and so it is not too heavy with mega minions.
Anyways, thoughts and feedback greatly appreciated. Will be testing and adapting this sometime just after the expansion drops, seeing if I can make it work.