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Purphoros: Yes, you can make a million tokens and kill with it, but if you make a million haste tokens, you're probably going to win anyway. Also, you're not card creature heavy, you're more all in on one creature or make a billion tokens.
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Valakut: I don't run this in Daretti and I run more mountains than you, and by the time it's active, you don't want to be doing small increments of three damage. Lastly, it enters tapped; that will cost you games. It's better in a dedicated combo or big mana deck.
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I'm super torn on the Mycosynth and Hellkite in here. You've got enough equipment that you can keep the Hellkite alive and big - that's good. On the other hand, you have almost no other cards that benefit from Mycosynth (no Unwinding clock, Paradox Engine, Clock of Omens, Karn, etc.). Don't get me wrong - it's a cool combo, but I find it super difficult to pull off, and it deviates from your Godo game plan. Yes, you can have Darksteel Forge out and blow up the board, but again, wouldn't you rather swing with his indestructible weapons for the kill?
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Magnus of the Moon: Yes, it's good, and it's not that expensive ($5), but it's also inconsistent because it's the only stax-like card in the deck. I try to cut out one-off effects as much as possible, so my deck is more predictable. Also, it's a creature, so it dies quickly, and you have few (if any) ways to reanimate it. (I promise that I'm not against this card - were it $1, I wouldn't have mentioned it. This feels like a card you add when it's more fleshed out.) I feel similarly about Leyline of Punishment - it's so random, but the fact that it's cheaper and hard to get rid of makes it seem better for this deck/budget.
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I'd up your land count to at least 36. Godo isn't cheap at 6 mana, and he's a "kill on-sight" commander. Your deck can function without him, but he's your focus. Furthermore, the best red ramp (which isn't actually specific to red) includes Gauntlet of Power and Caged Sun at 5 and 6. You have to hit those in order to take off. Yes, Extraplanar Lens functions similarly, but it really costs like 3.5/4 mana because it puts you down a land (and you don't have that many mountains, remember, it won't be as good).
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I didn't dig in too much regarding cards that I think you should consider. I'm sure you've got a lot of "I want this..." but one card I think is a must is Scrap Mastery, so freakin' broken.
