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pretty straight forward
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no point in mesas or tarns. you are running mono-red. Also, Mox opal is useless with this deck. I run a standard Kuldotha deck right now, and I have less focus on mana than you. Opals slow it down, I playtested it. The Mesas and Tarns kill me in the end, because the 2 or 3 life I wasted on fetching mountains could have saved me. Suggestions for you are: -4 Arid mesa, +4 Mountain -4 Scalding Tarn, +4 Contested War Zone -4 Ornithopter (out of standard), +4 Darksteel Relic -4 Lightning Bolt (again, post-rotation) +4 Spikeshot Elders (more goblins= bigger boosts) -2 Mox Opal, +2 Moltensteel Dragon (Game-changer, you need him in this deck) by doing my suggestions, not only do you have a smooth, well tested, runnable deck, you also save about $150 making it.
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i changed it a bit to make it standard although otherwise id want to leave at least 4 fetch lands in there simply b/c they thin your deck out. After your suggestions here what i changed -4 ornithopter -4 arid mesa -4 scalding tarn -4 lightning bolt -2 mox opal +4 contested warzone(forgot about this card ty) +3 spikeshot elder +3 hero of oxid ridge +4 goblin grenade +4 mountain