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It may not be much in terms of attack power, but the status effect is so strong that in a few turns, all the opponent's Pokemon may be rendered completely useless

Grand Crescendo also gives your creatures Indestructible until end of turn, so it acts as protection as well

If at least one of your opponents cant die for some reason, perhaps because they control Platinum Angel, the triggers keep happening ad infinitum and the game basically ends

It took more than just opening an envelope: you had to be an active part of the competitive community, answer complex questions about the rules, and meet very specific criteria