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The problem is that my burn spells are fairly weak and far between for the most part, so the izzet staticasters are used to chain together damage to take out the larger creatures that escape from the mortars range. The nivmagus elemental is good, but I can't see a reason that it'd be beneficial to sacrifice spells that I need in my deck to pump a creature.
It's actually pretty difficult to really see what you're trying to go for. On one hand, it looks like you're going for control, but on the other, there are aggro elements too (Dynacharge for example)
I'd recommend dropping the rings and Slumbering Dragon .As useful as the rings can be, I can't see a way to justify four of them. As nice as the dragons can be, they tend to get a weird game played around them. I'll demonstrate.
enemy player attacks with three creatures for 6 damage, putting three tokens on the dragon.ring of valkas kicks in on your turn, but it still can't attack or block.enemy player uses murder, unsummon, cyclonic rift, Ultimate price, dreadbore, or any number of bounce/kill mechanics
Searing Spear is your best friend. Instant speed for three damage? why not.
Goblin Electromancer will help string together your overloads on rift and mortar, as well as help my next suggestion.
card:Devil's Playthe point of this one is actually to have something you won't mind tossing to the yard if you draw with Izzet charm. If needed, you can use it to kill a big creature, or even have an alternate wincon.
Jace, Memory Adept would be a super nice addition to your deck. While slightly expensive, he's a great source of card draw, and, if nothing else, is the perfect distraction for your opponent to beat on instead of you. Best part is, He's cheap to buy.
Not telling you to copy my deck, but it might give you some ideas.