Well
I made a similar deck, but with some few improvements.
After a while of playing, i was getting taunted by all my quanta i could have used. It basicly just sat there, and i couldnt do a thing about it.
Heres the point. You only need 10 pillars, well, even only 9, because of your devourers!
In replacement of your towers, you can put, perhaps a dragon, or maybe some vampires.
If you find out you run low on health at times, put in some Liquid shadows to give your Gorgoyles some extra boost, it poisons them, but if you get the stone form before that time, it will be nothing to worry about.
I actually strongly recomend you to add some drain lifes, they have got a huge advantege over ice bolt etc. because of the life gain. If you stall up, lets say 30 mana, You will dmg 8 to a target creature/Opponent health and gain 8 HP, wich can lead you into many Elemental Masteries and can actually same you in some sutuations.
Over and out, and keep your ideas streaming