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Really good, but have you considered Reverberate? Adds another Instant to the stack for damage, and can do extra pain depending on what you copy.
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I have! That and increasing vengeance would fit very nicely in this deck. At this point I'm not 100% sure if it might be too much copy and not enough burn if I add it in, but it's definitely a good idea!
Another option if you're going to use Epic Experiment is to try Goblin Electrolizer. It reduces the cost of instants and sorceries by 1. So if you had say 4 on the field, then played Epic Experiment for R/U/4, you would then get 4 mana free, so it would actually be R/U/8 now! Just be careful you don't reverberate E.E., the X cost would drop to Zero for the second time.