a) 7 of your lands actually enter the battlefield tapped plus you play terrible lands like boilerworks... b) sol ring is banned in 1v1 as is Sensei divining top (yes there's a separate banlist for duel commander) for obvious reasons c) Niv mizzet is an expensive general i velieve it's worth being sure to have a strong protection for him each game and since you can't tutor your greaves... in my meta you'd be lucky if you manage to even equip him anyway... expensive generals sucks for competition etc.
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Hello a) you may wanna look at the ban list you intend to use b) is this intended to multi or 1v1 ? Whatever check point a) You made obvious choices of good cards but i think the overall combination look "not good" to me, for instance c) Isochron scepter is a very good card but, how many of your 100 cards do you think you can imprint on it ? d) look like you could add a lot of general protection card (boots for instance, there are a few more classic of sub-voltron edh) e) lot of land etb tapped, too much for multi, even too much for 1v1 hope that helps, i dig seriously on Izzet Edh for a very long time and i couldn't find yet something satisfying to me so maybe it's just me.