Historical Rules · 27 September 2013
Rule 602.4
Official source text from the 27 September 2013 Rules release
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.
Historical Rules · 27 September 2013
Official source text from the 27 September 2013 Rules release
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.