Historical Rules · 16 January 2016
Rule 602.4
Official source text from the 16 January 2016 Rules release
Activating an ability that alters costs won’t affect spells and abilities that are already on the stack.
Historical Rules · 16 January 2016
Official source text from the 16 January 2016 Rules release
Activating an ability that alters costs won’t affect spells and abilities that are already on the stack.