K.28 - X Costs


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K.28.1- When an {X} appears in the mana cost of a spell, you must choose a value for X that is a non-negative integer. Zero is legal unless otherwise stated on the card. [CompRules 1999/04/23]

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K.28.2- If more than one 'X' is in the mana cost, both 'X's must have the same value. In fact, all 'X's on the card are considered to have the same value. [CompRules 1999/04/23] For example, a spell that costs "{X}{X}{U}" to cast will cost "{4}{U}" if you choose for 'X' to be 2, and "{6}{U}" if you choose for 'X' to be 3.

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K.28.3- If there is an {X} in the mana cost of a spell, consider the amount paid in 'X' to be part of the cost while the spell is on the stack, but 'X' is zero after the card becomes a permanent or while the card is any place other than on the stack. [CompRules 1999/04/23]

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K.28.4- If a 'Y' or 'Z' appears in a cost, it follows the same rules that you follow for an 'X'. [D'Angelo 2000/02/15]

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K.28.Ruling.1- The value of 'X' is chosen when announcing the spell (before you pay the mana cost) and you cannot change this value later. [CompRules 1999/04/23]

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K.28.Ruling.2- If a card is put into play by means other than casting, any X in the mana cost is considered to be zero. [D'Angelo 1998/06/05]

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K.28.Ruling.3- If there is an X in the card but it is not in the mana cost, you decide the value of X on resolution (unless the card says otherwise). [DeLaney 2000/01/13]

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