History of CR 121.6

Every distinct wording since 2010, newest first.

July 12, 2019 · Core Set 2020
Some effects replace card draws.
May 3, 2019 · War of the Spark
Some spells and abilities refer to counters being put on an object. This refers to putting counters on that object while it’s on the battlefield and also to an object that’s given counters as it enters the battlefield.
January 25, 2019 · Ravnica Allegiance
Some spells and abilities refer to counters being put on an object. This refers to putting counters on that object while it's on the battlefield and also to an object that's given counters as it enters the battlefield.
April 28, 2017 · Amonkhet
Some spells and abilities refer to counters being put on an object. This refers to putting counters on that object while it’s on the battlefield and also to an object that’s given counters as it enters the battlefield.
April 8, 2016 · Shadows over Innistrad
Some spells and abilities refer to counters being “placed” on an object. This refers to putting counters on that object while it’s on the battlefield and also to an object that’s given counters as it enters the battlefield.
May 1, 2014 · Journey into Nyx
Some spells and abilities refer to counters being “placed” on an object. This refers to putting counters on that object while it’s on the battlefield and also to an object entering the battlefield with counters on it as a result of a replacement effect (see rule 614.1c).
February 1, 2014 · Born of the Gods
Some spells and abilities refer to counters being "placed" on an object. This refers to putting counters on that object while it’s on the battlefield and also to an object entering the battlefield with counters on it as a result of a replacement effect (see rule 614.1c).
October 1, 2012 · Return to Ravnica
If a spell or ability refers to a counter being "placed" on a permanent, it means putting a counter on that permanent while it's on the battlefield, or that permanent entering the battlefield with a counter on it as the result of an effect (see rule 614.1c).
September 30, 2011 · Innistrad
If a spell or ability refers to a counter being "placed" on a permanent, it means putting a counter on that permanent while it's on the battlefield, or that permanent entering the battlefield with a counter on it as the result of a replacement effect (see rule 614.1c).
June 17, 2011 · Commander 2011
If a spell or ability refers to a counter being “placed” on a permanent, it means putting a counter
May 1, 2011 · New Phyrexia
If a spell or ability refers to a counter being "placed" on a permanent, it means putting a counter on that permanent while it's on the battlefield, or that permanent entering the battlefield with a counter on it as the result of a replacement effect (see rule 614.1c).
February 1, 2010 · Worldwake
rule 121.6 not present in this release