Well fetchlands are very useful overall, hedron crab or not. That's why they're so expensive. It allows you to thin out your deck out of lands for more reliable (non-land, and otherwise useful spells) card draws.Speaking of getting the ball rolling, maybe Thought Scour? Although it might not be all that crucial to your strategy.
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Any space there for visions of beyond? It's ancestral recall for this type of deck. Also, fetchlands to combo with your hedron crab?