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I had 3 Nivmagus's sitting around, so I threw together an Izzet deck. Last night I sat down & tailored it a bit. I have yet to play it to see how it really runs, but basically, slap Illusionist Bracers on Nivmagus & pump him. For the rest, I have control spells, creatures that help with instant/sorceries, and even a little life gain from the Azorius guild. I may still ditch white as I don't have many shock lands, but we'll see.
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Reverberate would be better for this I think, so that way you can have more instants and sorceries to discard, and Izzet Guildmage is awesome in decks like this, though he's not standard.
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nivis guildmage might be good in place of the izzet guildmage, also offers some card draw/discard
I would cut the fall of the gavel for warlord's helix if you are going to be splashing white for anything, imo.