Historical Rules · 1 February 2013
Rule 601.4
Official source text from the 1 February 2013 Rules release
Casting a spell that alters costs won't affect spells and abilities that are already on the stack.
Historical Rules · 1 February 2013
Official source text from the 1 February 2013 Rules release
Casting a spell that alters costs won't affect spells and abilities that are already on the stack.