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RULINGS
2020-08-07
If a card in a player’s library has in its mana cost, X is considered to be 0.
2020-08-07
If a card in a player's library has in its mana cost, X is considered to be 0.
2025-06-06
If a card in a player's library has in its mana cost, X is 0 for the purpose of determining its mana value.