Hearthpwn

Professional player: Trump, recently ran a new free to play account to challenge himself to make it to legend with "new player" standards. Deck is 100% reliant on Frost Lich Janna as your free Deathknight from the Frozen Throne single player experience.

1. Run the prologue of Frozen Throne and (hopefully) receive Janna as your reward.

2. Do your free arena run/daily quests and build up experience with the account to make enough gold to buy a handful of packs.

3. MOST IMPORTANTLY: Since a recent update gives a legendary within your first 10 packs of EACH EXPANSION PACK SET, rotate to the next set after opening a legendary. With luck, after 1-2 weeks of playing you opened a few legendaries and other goodies.

4. Dust any and all cards for the ones in this decklist if you still wish to play elemental mage after opening all the packs. (You may have gotten lucky enough to open packs in sequential order to play a different or more advanced deck -  dependent on RNG.) 

As a warning this deck was not taken to legend rank by Trump. Your results could vary, but it is not a top tier deck by any means. However, I find it fun, it is meta current and won't have a single card rotate out in April, and it can still make it beyond rank 10 which is fantastic for a new player/account.