I have a few theories
Plus, youve knocked off at least some of your opponents boards
While we've had dominant decks and cards like Collected Company, Siege Rhino, Pack Rat, and Rally the Ancestors, those formats didn't see huge drops in attendance, and for the most part, by the time the outcry got loud, the problem card was already close to rotation (if you look at Rally and Bant Company, their most dominant times were in the two or three months before they rotated from the format)
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When the decks faced each other, a player armed with mean old Rith, the Awakener would have a distinct advantage even if he wasn't suited up and it would be almost impossible to deal with if he was