Historical Rules · 23 April 2010
Rule 601.4
Official source text from the 23 April 2010 Rules release
Casting a spell that alters costs won't affect spells and abilities that are already on the stack.
Historical Rules · 23 April 2010
Official source text from the 23 April 2010 Rules release
Casting a spell that alters costs won't affect spells and abilities that are already on the stack.