History of CR 401.1
Every distinct wording since 2010, newest first.
May 3, 2019 · War of the Spark
When a game begins, each player’s deck becomes their library.
January 25, 2019 · Ravnica Allegiance
When a game begins, each player's deck becomes their library.
April 27, 2018 · Dominaria
When a game begins, each player’s deck becomes their library.
February 1, 2014 · Born of the Gods
When a game begins, each player’s deck becomes his or her library.
September 30, 2011 · Innistrad
When a game begins, each player's deck becomes his or her library.
June 17, 2011 · Commander 2011
When a game begins, each player’s deck becomes his or her library.
April 1, 2011 · Duel Decks: Knights vs. Dragons
When a game begins, each player's deck becomes his or her library.
October 1, 2010 · Scars of Mirrodin
When a game begins, each player’s deck becomes his or her library.
February 1, 2010 · Worldwake
When a game begins, each player's deck becomes his or her library.