Its just that, if youre an aggressive deck with Gray Merchant, your opponent has a clear path to beating you (they kill all your creatures), whereas if youre more of a hybrid deck, suddenly one-for-oneing you over and over is not a winning strategy anymore, so if they play to beat Gray Merchant theyll lose to the rest of your deck
If you want to put a face-down card in exile into its owners graveyard, you must first choose one of these groups and then choose a card from within that group at random
You can slap it in a Kenrith, the Returned King deck as an alternate win condition with a slightly worse manabase
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But the same realism could lead to unethical misuse