I've been working on a Mage spell power control deck for a little while now. There are lots of variants of this out there, but I think that this is more consistent than most; I have more minions and fewer spells than some would advise, but this just allows the spells we do have to be more effective, and gives us some decent card draw. Currently I'm sitting at an 80% win-rate in 3-star-masters with about 30 games played.
The deck itself can be found here.
A few notes: