It can make something an artifact permanently, and it plays into any deck's framework where you want to en-artifact your stuff to enhance them with cards like Darksteel Forge or Padeem, Consul of Innovation
Just as Burn struggles to win with Lightning Bolt alone, you need a cheap creature that generates value over time in order to really maximize your mill count, and the Crab is simply best-in-class
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Like Tome of the Infinite, I expect players will try it, if not in the main deck then in the sideboard, but I'm unsure if it will stick around
There's a reason this is hidden in a secret library, and is a fair price to pay for a legendary artifact with this much impact
4 Aetherdrift Commander Deck - Living Energy $26.97 Build Your Energy Economy Energy-focused decks can be some of the most enjoyable to play in Commander and while many were disappointed with Aetherdrift, this precon released alongside the set gives you a wonderful energy Commander deck