Historical Rules · 26 August 2016
Rule 601.5
Official source text from the 26 August 2016 Rules release
Casting a spell that alters costs won’t affect spells and abilities that are already on the stack.
Historical Rules · 26 August 2016
Official source text from the 26 August 2016 Rules release
Casting a spell that alters costs won’t affect spells and abilities that are already on the stack.