Each opponent reveals cards from the top of their library until they reveal X land cards, then puts all cards revealed this way into their graveyard. X can't be 0.
Legalities
tlrlegal
duellegal
brawlnot legal
pennylegal
PreDH
Rulings · 2
wotc
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.
wotc
If an opponent’s library contains fewer than X land cards, all cards from that library are revealed and put into their graveyard.
Notes
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