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As a bonus, we can demonstrate it to get the effect again

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

I love this with a sort of Voltron build too

Blue had flyers, which couldn't block shadow creatures, and green and red had non-shadow creatures which couldn't block shadow creatures or flyers