Historical Rules · 16 July 2010
Rule 602.4
Official source text from the 16 July 2010 Rules release
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.
Historical Rules · 16 July 2010
Official source text from the 16 July 2010 Rules release
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.