History of CR 302.4a
Every distinct wording since 2010, newest first.
May 3, 2019 · War of the Spark
A creature’s power is the amount of damage it deals in combat.
January 25, 2019 · Ravnica Allegiance
A creature's power is the amount of damage it deals in combat.
February 1, 2014 · Born of the Gods
A creature’s power is the amount of damage it deals in combat.
September 30, 2011 · Innistrad
A creature's power is the amount of damage it deals in combat.
June 17, 2011 · Commander 2011
A creature’s power is the amount of damage it deals in combat.
April 1, 2011 · Duel Decks: Knights vs. Dragons
A creature's power is the amount of damage it deals in combat.
October 1, 2010 · Scars of Mirrodin
A creature’s power is the amount of damage it deals in combat.
February 1, 2010 · Worldwake
A creature's power is the amount of damage it deals in combat.