Every distinct wording since 2010, newest first.
July 12, 2019 · Core Set 2020
An activated ability is targeted if it identifies something it will affect by using the phrase “target [something],” where the “something” is a phrase that describes an object and/or player. The target(s) are chosen as the ability is activated; see rule 602.2b.
February 1, 2010 · Worldwake
A player may take some special actions any time he or she has priority. A player may take other special actions during his or her main phase any time he or she has priority and the stack is empty. See rule 114, "Special Actions."