Historical Rules · 17 June 2011
Rule 601.4
Official source text from the 17 June 2011 Rules release
Casting a spell that alters costs won't affect spells and abilities that are already on the stack.
Historical Rules · 17 June 2011
Official source text from the 17 June 2011 Rules release
Casting a spell that alters costs won't affect spells and abilities that are already on the stack.