The larger the deck, the harder they fall, or so the saying goes
It was an important reminder for new players, and easily ignored by experienced players
Even outside combos, its a reliable removal piece that keeps on coming back
Mm'menon, the Right Hand Maybe you made a bunch of gnomes, food, or clues, or you have an Ichor Wellspring just sitting around, Mm'menon, the Right Hand turns all of those into mana rocks, and as long as you play cards from the top of the library like it allows, or cast from exile, or the graveyard, you'll more than get your money's worth out of Mm'menon
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This allows you to pivot from an aggressive card-draw strategy to a purely defensive posture, shielding your most vital permanents from targeted removal