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Red/Black Eldrazi deck
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I think that the piranha marsh and the akoum refuge really do very little for you, plus they slow down your mana generation down a considerable amount. you really don't need dual color lands when you are running two colors. Also, it may cost 2 colorless more to play, but I would recommend Dreamstone Hedron over Khalni Gem, because, once again, you really don't need things that can for multiple colors. by the time you play a Dreamstone Hedron, you probably have all the black and red you really need already.
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Thanks for the suggestions, I agree with it all and made changes