History of CR 602.1

Every distinct wording since 2010, newest first.

May 3, 2019 · War of the Spark
Activated abilities have a cost and an effect. They are written as “[Cost]: [Effect.] [Activation instructions (if any).]”
January 25, 2019 · Ravnica Allegiance
Activated abilities have a cost and an effect. They are written as "[Cost]: [Effect.] [Activation instructions (if any).]"
May 1, 2014 · Journey into Nyx
Activated abilities have a cost and an effect. They are written as “[Cost]: [Effect.] [Activation instructions (if any).]”
September 30, 2011 · Innistrad
Activated abilities have a cost and an effect. They are written as "[Cost]: [Effect.] [Activation instructions (if any).]"
June 17, 2011 · Commander 2011
Activated abilities have a cost and an effect. They are written as “[Cost]: [Effect.] [Activation
April 1, 2011 · Duel Decks: Knights vs. Dragons
Activated abilities have a cost and an effect. They are written as "[Cost]: [Effect.] [Activation instructions (if any).]"
February 4, 2011 · Mirrodin Besieged
Activated abilities have a cost and an effect. They are written as “[Cost]: [Effect.] [Activation instructions (if any).]”
October 1, 2010 · Scars of Mirrodin
Activated abilities have a cost and an effect. They are written as “[Cost]: [Effect.] [Activation
July 16, 2010 · Magic 2011
Activated abilities have a cost and an effect. They are written as "[Cost]: [Effect.] [Activation instructions (if any).]"
February 1, 2010 · Worldwake
Activated abilities have a cost and an effect. They are written as "[Cost]: [Effect.] [Activation restriction (if any).]" The activation cost is everything before the colon (:). An ability's activation cost must be paid by the player who is activating it.