Historical Rules · 25 January 2019
Rule 602.4
Official source text from the 25 January 2019 Rules release
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.
Historical Rules · 25 January 2019
Official source text from the 25 January 2019 Rules release
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.