Historical Rules · 1 May 2013
Rule 602.4
Official source text from the 1 May 2013 Rules release
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.
Historical Rules · 1 May 2013
Official source text from the 1 May 2013 Rules release
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.