This is the freeze mage deck I played to #18 Legend over the course of six hours: vod here
I also finished the season at #12 Legend after playing nothing but this deck for the final week of the season.
With only two legendaries it's not the most expensive deck out there, and in my opinion it's the most viable mage in today's high-legend meta.
edit: 2x loothoarder out for 2x novice engi for better topdeck value later in the game
For more freeze mage, my stream's found at www.twitch.tv/itsotter
(deck name courtesy of Hyp3d)