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Having that ability in the command zone is very powerful

Then she drops the cost of everything by 1 generic mana, not just artifacts and enchantments which you might expect since she's an Artificer, but everything

Includes an equal number of Forests, Islands, Mountains, Plains, and Swamps from sets that may range from Revised (3rd Edition) to the most current Magic: The Gathering (MTG) release

[12] Put yourself in the other players shoes when youre thinking about making a deal

And there are even fewer that can be played mono-colored Commander decks. All two-cost mana rocks seem to retain demand and value despite multiple reprints