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Thankfully, over the past decade, even Wizards has realized that partners are pretty broken, and now they avoid printing more cards with the mechanic, instead relying on various partner-with-style mechanics that do something similar but with a much smaller pool of cards to choose from, like how you can partner a Doctor's companion with a Doctor from the Doctor Who set

Consider the opportunity cost

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WotC was skeptical about whether such a system could be implemented

One card prevents Graveyard dumping, another punishes your opponent if they Summoned too many monsters, and the third gives you a reprieve if they set up a monstrously large field on their first turn