History of CR 510.1b

Every distinct wording since 2010, newest first.

April 14, 2023 · March of the Machine
An unblocked creature assigns its combat damage to the player, planeswalker, or battle it’s attacking. If it isn’t currently attacking anything (if, for example, it was attacking a planeswalker that has left the battlefield), it assigns no combat damage.
May 3, 2019 · War of the Spark
An unblocked creature assigns its combat damage to the player or planeswalker it’s attacking. If it isn’t currently attacking anything (if, for example, it was attacking a planeswalker that has left the battlefield), it assigns no combat damage.
January 25, 2019 · Ravnica Allegiance
An unblocked creature assigns its combat damage to the player or planeswalker it's attacking. If it isn't currently attacking anything (if, for example, it was attacking a planeswalker that has left the battlefield), it assigns no combat damage.
February 1, 2014 · Born of the Gods
An unblocked creature assigns its combat damage to the player or planeswalker it’s attacking. If it isn’t currently attacking anything (if, for example, it was attacking a planeswalker that has left the battlefield), it assigns no combat damage.
September 30, 2011 · Innistrad
An unblocked creature assigns its combat damage to the player or planeswalker it's attacking. If it isn't currently attacking anything (if, for example, it was attacking a planeswalker that has left the battlefield), it assigns no combat damage.
June 17, 2011 · Commander 2011
An unblocked creature assigns its combat damage to the player or planeswalker it’s
April 1, 2011 · Duel Decks: Knights vs. Dragons
An unblocked creature assigns its combat damage to the player or planeswalker it's attacking. If it isn't currently attacking anything (if, for example, it was attacking a planeswalker that has left the battlefield), it assigns no combat damage.
February 4, 2011 · Mirrodin Besieged
An unblocked creature assigns its combat damage to the player or planeswalker it’s attacking. If it isn’t currently attacking anything (if, for example, it was attacking a planeswalker that has left the battlefield), it assigns no combat damage.
October 1, 2010 · Scars of Mirrodin
An unblocked creature assigns its combat damage to the player or planeswalker it’s
February 1, 2010 · Worldwake
An unblocked creature assigns its combat damage to the player or planeswalker it's attacking. If it isn't currently attacking anything (if, for example, it was attacking a planeswalker that has left the battlefield), it assigns no combat damage.