History of CR 701.2a

Every distinct wording since 2010, newest first.

May 3, 2019 · War of the Spark
To activate an activated ability is to put it onto the stack and pay its costs, so that it will eventually resolve and have its effect. Only an object’s controller (or its owner, if it doesn’t have a controller) can activate its activated ability unless the object specifically says otherwise. A player may activate an ability if they have priority. See rule 602, “Activating Activated Abilities.”
January 25, 2019 · Ravnica Allegiance
To activate an activated ability is to put it onto the stack and pay its costs, so that it will eventually resolve and have its effect. Only an object's controller (or its owner, if it doesn't have a controller) can activate its activated ability unless the object specifically says otherwise. A player may activate an ability if they have priority. See rule 602, "Activating Activated Abilities."
April 27, 2018 · Dominaria
To activate an activated ability is to put it onto the stack and pay its costs, so that it will eventually resolve and have its effect. Only an object’s controller (or its owner, if it doesn’t have a controller) can activate its activated ability unless the object specifically says otherwise. A player may activate an ability if they have priority. See rule 602, “Activating Activated Abilities.”
May 1, 2014 · Journey into Nyx
To activate an activated ability is to put it onto the stack and pay its costs, so that it will eventually resolve and have its effect. Only an object’s controller (or its owner, if it doesn’t have a controller) can activate its activated ability unless the object specifically says otherwise. A player may activate an ability if he or she has priority. See rule 602, “Activating Activated Abilities.”
February 1, 2014 · Born of the Gods
To activate an activated ability is to put it onto the stack and pay its costs, so that it will eventually resolve and have its effect. Only an object’s controller (or its owner, if it doesn’t have a controller) can activate its activated ability unless the object specifically says otherwise. A player may activate an ability if he or she has priority. See rule 602, "Activating Activated Abilities."
September 30, 2011 · Innistrad
To activate an activated ability is to put it onto the stack and pay its costs, so that it will eventually resolve and have its effect. Only an object's controller (or its owner, if it doesn't have a controller) can activate its activated ability unless the object specifically says otherwise. A player may activate an ability if he or she has priority. See rule 602, "Activating Activated Abilities."
June 17, 2011 · Commander 2011
To activate an activated ability is to put it onto the stack and pay its costs, so that it will
April 1, 2011 · Duel Decks: Knights vs. Dragons
To activate an activated ability is to put it onto the stack and pay its costs, so that it will eventually resolve and have its effect. Only an object's controller (or its owner, if it doesn't have a controller) can activate its activated ability unless the object specifically says otherwise. A player may activate an ability if he or she has priority. See rule 602, "Activating Activated Abilities."
February 4, 2011 · Mirrodin Besieged
To activate an activated ability is to put it onto the stack and pay its costs, so that it will eventually resolve and have its effect. Only an object’s controller (or its owner, if it doesn’t have a controller) can activate its activated ability unless the object specifically says otherwise. A player may activate an ability if he or she has priority. See rule 602, “Activating Activated Abilities.”
October 1, 2010 · Scars of Mirrodin
To activate an activated ability is to put it onto the stack and pay its costs, so that it will
February 1, 2010 · Worldwake
To activate an activated ability is to put it onto the stack and pay its costs, so that it will eventually resolve and have its effect. Only an object's controller (or its owner, if it doesn't have a controller) can activate its activated ability unless the object specifically says otherwise. A player may activate an ability if he or she has priority. See rule 602, "Activating Activated Abilities."