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You just have too few lands, even with your plans to muscle out a few more and speed up the deck. I suggest cut both Chandra Ablaze add in 2 more mountains cuz lets face it you will NEVER cast that card with your mana pool as it sits now. It will always be a dead draw in your hand.
Similarly i would cut Shrine of Burning Rage you aren't focused too heavily on colored red cards so this isn't a super useful card, and is super slow to come out. Cut both and add 2 more mountains.
Similarly i would cut Culling Dais this deck is not about life gain it is about beat down and artifact sacing cut both and add 2 more mountains.