Historical Rules · 5 October 2018
Rule 602.4
Official source text from the 5 October 2018 Rules release
Activating an ability that alters costs won’t affect spells and abilities that are already on the stack.
Historical Rules · 5 October 2018
Official source text from the 5 October 2018 Rules release
Activating an ability that alters costs won’t affect spells and abilities that are already on the stack.