This search based on the January 15, 2004 release of the Rulings.
G24.1 - X
- G24.1a - If a cost has 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. See
Rule 409, "Playing Spells and Activated Abilities." [CompRules 2003/12/01]
- G24.1b - In triggered abilities, X is defined when the ability resolves. It
may be defined by the text of the ability, by a keyword ability of the
card, or by the trigger event. See Rule 410, "Handling Triggered
Abilities." [CompRules 2003/07/01]
- G24.1c - In other cases, X is defined by the text of a spell or ability. 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 2003/07/01]
This search based on the January 15,2004 release of the Rulings.
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