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You can cast this creature for its evoke cost to put a stop to an opponents shenanigans at instant speed putting all of the cards in their graveyard on the bottom of their library

His enter the battlefield trigger hits cards in the hand, his attack trigger affects the library directly and his dies trigger will remove half the permanents from one unlucky opponent's battlefield

DarkNite's brother, Manawyddan fab Llyr, is the final boss of Duelist of the Roses and the only opponent players will face no matter who they side with

Also, given it is at the pinnacle of the attack barrier by being 1900 it also cuts off nearly any kinds of attacking as well