Historical Rules · 18 June 2010
Rule 602.4
Official source text from the 18 June 2010 Rules release
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.
Historical Rules · 18 June 2010
Official source text from the 18 June 2010 Rules release
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.