Hearthpwn

My changes:

-2 Fireball (Usually not enough in the early game to do much, imo.)

-1 Meteor (Admittedly, I didn't have two of these to run, so I'm just making a substitution.)

-1 Frost Lich Jaina (Dead card through and through. The enemy usually has big enough minions that makes the lifesteal and hero power useless, or the game ends before this card is played.)

-1 Molten Reflection: Having two just made the second one a dead card a lot of the time.

+2 Frost Nova (Stall is lovely. It's what makes Exodia Mage what it is, even without Ice Block. This does make Dragon's Fury a bit weaker, but still handy against all those minions on the enemy's board.)

+1 Zola the Gorgon (Basically another Simulacrum. Made dumping a Frost Nova or Ice Barrier easier at turn 7. Could alternatively copy a Witchwood Piper should you desperately need to thin out your deck more or even fish out that Archmage Antonidas if you've drawn every other minion in the deck.)

+2 Cone of Cold (More stall. Nuff said.)

Cards I tried that didn't make the cut:

Voodoo Doll: Tried for synergy with Frost Lich Jaina and removal that bypasses Spell Immune targets, but it was a little too slow and useless at the time.

Acolyte of Pain: I ended up with more cards in my hand than I could remove, so that was a bust.

I tried Acolyte of Pain as well as Loot Hoarder but with the amount of fishing cards out of your deck and such high cost removal I too felt like it was too much card draw and ended up with full hand or card draw, I have Zola the Gorgon and didn't even think to put her into the deck, seems to work fine when I played around with it. Love Freeze effects, but I didn't think they would be necessary in this deck due to the amount of board clears, but it's definitely superior vs stickier minions like odd paladin when they get divine shield on all of their minions via Unidentified Maul - didn't think to include them originally because of the fact you can't run Doomsayer without messing up your Witchwood Piper. Fireball was a card I was looking to get rid of and Zola the Gorgon and Frost Nova fill that void-  when I've played Frost Lich Jaina which is most games that make it to turn 9 with this deck I feel like she puts pressure on the opponent and forces them into playing around her every turn, not to mention the synergy with Polymorph I like to include her just because it's a powerful card in any mage deck that's going past turn 9 however admittedly after trying games without her I didn't see a drastic change- your win condition stays the same, you still have board clears and freezes, she's definitely not 100% necessary in the deck. Thankyou for all your feedback and cuts! 

Playing a little more, I've come to realize that perhaps Frost Lich Jaina is not such a dead card. There were times when I needed more turns and some extra sustain beyond Ice Barrier. I'm willing to make it a useful side card if I need it.