History of CR 106.4a

Every distinct wording since 2010, newest first.

May 3, 2019 · War of the Spark
If any mana remains in a player’s mana pool after mana is spent to pay a cost, that player announces what mana is still there.
January 25, 2019 · Ravnica Allegiance
If any mana remains in a player's mana pool after mana is spent to pay a cost, that player announces what mana is still there.
April 27, 2018 · Dominaria
If any mana remains in a player’s mana pool after mana is spent to pay a cost, that player announces what mana is still there.
February 1, 2014 · Born of the Gods
If a player passes priority (see rule 116) while there is mana in his or her mana pool, that player announces what mana is there. If any mana remains in a player’s mana pool after he or she spends mana to pay a cost, that player announces what mana is still there.
September 30, 2011 · Innistrad
If a player passes priority (see rule 116) while there is mana in his or her mana pool, that player announces what mana is there. If any mana remains in a player's mana pool after he or she spends mana to pay a cost, that player announces what mana is still there.
June 17, 2011 · Commander 2011
If a player passes priority (see rule 116) while there is mana in his or her mana pool, that
April 1, 2011 · Duel Decks: Knights vs. Dragons
If a player passes priority (see rule 116) while there is mana in his or her mana pool, that player announces what mana is there. If any mana remains in a player's mana pool after he or she spends mana to pay a cost, that player announces what mana is still there.
February 4, 2011 · Mirrodin Besieged
If a player passes priority (see rule 116) while there is mana in his or her mana pool, that player announces what mana is there. If any mana remains in a player’s mana pool after he or she spends mana to pay a cost, that player announces what mana is still there.
October 1, 2010 · Scars of Mirrodin
If a player passes priority (see rule 116) while there is mana in his or her mana pool, that
July 16, 2010 · Magic 2011
If a player passes priority (see rule 116) while there is mana in his or her mana pool, that player announces what mana is there. If any mana remains in a player's mana pool after he or she spends mana to pay a cost, that player announces what mana is still there.
February 1, 2010 · Worldwake
If a player passes priority (see rule 115) while there is mana in his or her mana pool, that player announces what mana is there. If any mana remains in a player's mana pool after he or she spends mana to pay a cost, that player announces what mana is still there.