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It actually ascends to be better than its inspiration since the Tempered Steel effect counts all your other artifact creatures, not just the Gnomes created by this effect

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I've also read that the term came from a Vintage deck which was called "The Four Thousand Dollar Solution"

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Explore the Underdark could see play in specific decks that require Gate synergy or additional land drops, but it may not be a top choice in most competitive decks