Stregoneria
Ogni avversario rivela carte dalla cima del proprio grimorio fino a che non rivela X carte terra, poi mette tutte le carte rivelate in questo modo nel proprio cimitero. X non può essere 0.
If another spell or ability instructs you to cast Mind Grind “without paying its mana cost,” you won’t be able to. You must pick 0 as the value of X in the mana cost of a spell being cast “without paying its mana cost,” but the X in Mind Grind’s mana cost can’t be 0.
If an opponent’s library contains fewer than X land cards, all cards from that library are revealed and put into their graveyard.