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This search based on the March 17, 2008 release of the Rulings.
G24.1 - X
- G24.1a - If a spell or activated ability has a cost with an "{X}" in it, the
value of X must be announced 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
amount announced as part of playing the spell or ability. If a card in
any other zone has {X} in its mana cost, the amount is treated as 0. If
you're playing a spell that has {X} in its mana cost and an effect lets
you play it without paying any cost that includes X, the only legal choice
for X is 0. This does not apply to effects that only reduce a cost, even
if they reduce it to zero. See Rule 409, "Playing Spells and Activated
Abilities." [CompRules 2007/10/01]
- G24.1b - 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]
- G24.1c - In other cases, X is defined by the text of a spell or ability.
Note that the value of X may change while that spell or ability is on the
stack. If X isn't defined, the controller of the spell or ability chooses
the value of X. All Xs on an object have the same value.
[CompRules 2007/10/01]
- Note - Also see Rule 409.1b, "Playing Spells and Activated Abilities."
This search based on the March 17, 2008 release of the Rulings.
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