I think you put 9 plains instead of mountains.Other than that, looks great! I like the idea of overloading Dragonshift with a bunch of puny goblins.
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For one extra mana, Mirko Vosk is probably more effective than the Blizzard Specters. You seem to have a lot of discard and some mill, but once you get 4 or 5 turns into the game, there's not going to be cards for you to make them discard. I would switch out some discard for more milling, but that's just me.Also, since it seems like it's pretty focused on dealing combat damage, you might want to look into some cipher cards like Paranoid Delusions or Mental Vapors.I do like that transmute will get you any of your instants. Too bad they only go to your hand!