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This search based on the August 10, 2008 release of the Rulings.
G24.1 - X
- G24.1a - Many cards use the letter X as a placeholder for a number that
needs to be determined. All instances of X on an object have the same
value. [CompRules 2008/07/15]
- G24.1b - If a spell or activated ability has a cost with an "{X}" in it, and
the value of X isn't defined by the text of that spell or ability, the
controller of that spell or ability chooses and announces the value of X
as part of playing the spell or ability. (See Rule 409, "Playing Spells
and Activated Abilities.") While the spell or ability is on the stack,
the {X} in its mana cost equals the announced value.
[CompRules 2008/07/15]
- G24.1c - If you're playing a spell that has {X} in its mana cost, the value
of X isn't defined by the text of that spell, and and effect lets you play
that spell without paying any cost that includes {X}, then the only legal
choice for X is 0. This doesn't apply to effects that only reduce a cost,
even if they reduce it to zero. See Rule 409, "Playing Spells and
Activated Abilities." [CompRules 2008/07/15]
- G24.1d - If a cost associated with a special action, such as a suspend cost
or a morph cost, has an "{X}" in it, the value of X is chosen by the
player taking the special action as he or she pays that cost.
[CompRules 2007/05/01]
- G24.1e - If a card in any zone other than the stack has {X} in its mana
cost, the value of {X} is treated as 0, even if the value of X is defined
somewhere within its text. [CompRules 2008/07/15]
- G24.1f - In other cases, X appears in the text of a spell or ability but
not in a mana cost or activation cost. If the value of X is defined by
the text of that spell or ability, then that's the value of X while that
spell or ability is on the stack. The controller of that spell or
ability doesn't get to choose the value. Note that the value of X may
change while that spell or ability is on the stack. If the value of X
isn't defined, the controller of the spell or ability chooses the value
of X. [CompRules 2008/07/15]
- Note - Also see Rule 409.1b, "Playing Spells and Activated Abilities."
This search based on the August 10, 2008 release of the Rulings.
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