Nemesis of Reason
Creature — Leviathan Horror
Oracle Text
Whenever this creature attacks, defending player mills ten cards.Rules for this card
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To mill a number of cards, a player puts that many cards from the top of their library into their graveyard. See rule 701.17.
Rulings (1)
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Wizards of the CoastIf the defending player has fewer than ten cards in their library, that player's entire library is put into their graveyard.