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It costs a mana more and has a far smaller range of targets

With other complementary artifact mana sources like Thran Dynamo and Grim Monolith, decks could count on being able to get the kind of mana you'd need to justify packing the cards that would let you use the mana from Metalworker to deliver the knockout blow, and their presence lets you turn that Metalworker mana into permanent giant amounts of mana rather than just a one shot deal

There are plenty of tapped lands that seemingly do more, but the new cycle has one distinct characteristic

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They may be weak little beginner-friendly decks, but theres so much going on in them that we havent seen in the game before

Its like a blue Braids, Cabal Minion effect for lands only