Lies flat no curling or slipping during play
Even if there were something that would make it reasonable on a power level basis, I think anyone in charge of the format would avoid unbanning one of these because of that
Its where people of all ages and skill levels come to play, trade, and hang out
It functions as a card advantage engine, allowing you to trade your small critters in for cards and the drain ability can straight up win you the game
But even if Kazuul's not pumping out creature tokens every combat, not being attacked is a reward in itself
Over time, a control or midrange deck can crank down on the combo deck by continuously hitting them with said disruption, ultimately making for an interesting and complicated game where both players have a lot of decisions that matter