Rule evolution
Rule 107.3f
Previously numbered 107.3e.
Earliest archived Rules release: 2009-10-01 · 0 wording revisions · 1 renumbering
Earliest archived Rules release107.3eDetails
Sometimes X appears in the text of a spell or ability but not in a mana cost, alternative cost, additional cost, or activation cost. If the value of X isn't defined, the controller of the spell or ability chooses the value of X at the appropriate time (either as it's put on the stack or as it resolves).
Renumbered
107.3e→ 107.3fDetailsPreviously
1. Game Concepts
107. Numbers and SymbolsThen
1. Game Concepts
107. Numbers and SymbolsSometimes X appears in the text of a spell or ability but not in a mana cost, alternative cost, additional cost, or activation cost. If the value of X isn’t defined, the controller of the spell or ability chooses the value of X at the appropriate time (either as it’s put on the stack or as it resolves).