History of CR 602.4
Every distinct wording since 2010, newest first.
May 3, 2019 · War of the Spark
Activating an ability that alters costs won’t affect spells and abilities that are already on the stack.
January 25, 2019 · Ravnica Allegiance
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.
February 1, 2014 · Born of the Gods
Activating an ability that alters costs won’t affect spells and abilities that are already on the stack.
September 30, 2011 · Innistrad
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.
June 17, 2011 · Commander 2011
Activating an ability that alters costs won’t affect spells and abilities that are already on the
April 1, 2011 · Duel Decks: Knights vs. Dragons
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.
February 4, 2011 · Mirrodin Besieged
Activating an ability that alters costs won’t affect spells and abilities that are already on the stack.
October 1, 2010 · Scars of Mirrodin
Activating an ability that alters costs won’t affect spells and abilities that are already on the
February 1, 2010 · Worldwake
Activating an ability that alters costs won't affect spells and abilities that are already on the stack.