History of CR 805.5a
Every distinct wording since 2010, newest first.
April 27, 2018 · Dominaria
A player may cast a spell, activate an ability, or take a special action when their team has priority.
September 30, 2011 · Innistrad
A player may cast a spell, activate an ability, or take a special action when his or her team has priority.
June 17, 2011 · Commander 2011
A player may cast a spell, activate an ability, or take a special action when his or her team
February 4, 2011 · Mirrodin Besieged
A player may cast a spell, activate an ability, or take a special action when his or her team has priority.
October 1, 2010 · Scars of Mirrodin
A player may cast a spell, activate an ability, or take a special action when his or her team
June 18, 2010 · Archenemy
A player may cast a spell, activate an ability, or take a special action when his or her team has priority.
February 1, 2010 · Worldwake
rule 805.5a not present in this release