The owner of this deck hasn't added a sideboard, they probably should...
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Super duper combos with Gelectrode and Kiln Fiend.
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In my opinion (feel free to disagree, it your deck :) ) It is not worth adding black into a functioning izzet-like combo deck for only 2x terminate and 4x swipe. These six cards plus the multi colored lands make it harder to cast what you really need to make your creatures effective. I would add in some instant counters like counterspell or double negative (either instead of or alongside mana leak ) because that will help you control the game. Cards like replicate and reflect are also good for buffing kiln fiend, and for untapping tapping untapping tapping (etc till win :P) with gelectrode.
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I appreciate your comment and I went through the same considerations. I haven't gotten around to testing it yet, but I think it'd be worth it if it works