Both players can place one basic Pokmon card facedown, this becomes their active Pokmon, plus up to five more basic Pokmon onto their bench
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)
Kefkas Tower Bolas's Citadel has a tough mana cost and doesnt do much the turn you play it, but it can offer runaway card advantage
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Regardless, we really like the aesthetic of how they look and feel it's important for something that sees so much play to be as visually pleasing as possible