This is branching to other colors, but Indomitable Archangel would keep your artifact safe, and a whispersilk cloak on her keeps her safe. Just a though.
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I don't think you can mix uncards with anything but silver boarder cards.
What I like about this deck is that even if you only got 2 mountains in the draw and the next few turn up 3-4 turns later, you're still able to lightning bolt, chain light, and thunderbolt them along with throwing out hellspark and spark elementals. Reverberating something like fireball or one of the many other spells is always fun.