Card text
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Official rulings
2 rulings · in English, source ScryfallIf 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.
2013-01-24 · Wizards of the CoastIf an opponent’s library contains fewer than X land cards, all cards from that library are revealed and put into their graveyard.
2013-01-24 · Wizards of the CoastAll printings