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Ghostly Prison does a great job getting to the late game by making opponents choose between attacking and casting spells and every player wants to cast spells

You see, not only does she halve any damage dealt to your or your permanents, but she also doubles the damage you deal to your opponents and their permanents

and Mew for example, it would be fairly criminal if Mewtwo wasn't involved too

That variety is useful whether you collect across multiple games and sports or you are attending with friends or family who all chase different things

Dont get me wrong: Its banned for good reasons, but it's simply hilarious