History of CR 510.1a

Every distinct wording since 2010, newest first.

May 3, 2019 · War of the Spark
Each attacking creature and each blocking creature assigns combat damage equal to its power. Creatures that would assign 0 or less damage this way don’t assign combat damage at all.
January 25, 2019 · Ravnica Allegiance
Each attacking creature and each blocking creature assigns combat damage equal to its power. Creatures that would assign 0 or less damage this way don't assign combat damage at all.
February 1, 2014 · Born of the Gods
Each attacking creature and each blocking creature assigns combat damage equal to its power. Creatures that would assign 0 or less damage this way don’t assign combat damage at all.
September 30, 2011 · Innistrad
Each attacking creature and each blocking creature assigns combat damage equal to its power. Creatures that would assign 0 or less damage this way don't assign combat damage at all.
June 17, 2011 · Commander 2011
Each attacking creature and each blocking creature assigns combat damage equal to its
April 1, 2011 · Duel Decks: Knights vs. Dragons
Each attacking creature and each blocking creature assigns combat damage equal to its power. Creatures that would assign 0 or less damage this way don't assign combat damage at all.
February 4, 2011 · Mirrodin Besieged
Each attacking creature and each blocking creature assigns combat damage equal to its power. Creatures that would assign 0 or less damage this way don’t assign combat damage at all.
October 1, 2010 · Scars of Mirrodin
Each attacking creature and each blocking creature assigns combat damage equal to its
February 1, 2010 · Worldwake
Each attacking creature and each blocking creature assigns combat damage equal to its power. Creatures that would assign 0 or less damage this way don't assign combat damage at all.