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Exile all opponents' graveyards, then create X 0/1 black Thrull creature tokens, where X is the greatest power among creature cards exiled this way

While its a relief to know you defeated them, theres still two issues: The fact that this individual could come back, since you told Professor Hibiki that it sped away after your encounter, and the fact that you seem to be his voice trailed off as he searched for a suitable word

WotC fixed this issue with a nice solution in Khans of Tarkir

As permanents are so much better than spells these days Austere Command is one of the most comfortable mass removal spells you can hope to play