History of CR 608.2a

Every distinct wording since 2010, newest first.

May 3, 2019 · War of the Spark
If a triggered ability has an intervening “if” clause, it checks whether the clause’s condition is true. If it isn’t, the ability is removed from the stack and does nothing. Otherwise, it continues to resolve. See rule 603.4.
January 25, 2019 · Ravnica Allegiance
If a triggered ability has an intervening "if" clause, it checks whether the clause's condition is true. If it isn't, the ability is removed from the stack and does nothing. Otherwise, it continues to resolve. See rule 603.4.
May 1, 2014 · Journey into Nyx
If a triggered ability has an intervening “if” clause, it checks whether the clause’s condition is true. If it isn’t, the ability is removed from the stack and does nothing. Otherwise, it continues to resolve. See rule 603.4.
February 1, 2014 · Born of the Gods
If a triggered ability has an intervening "if" clause, it checks whether the clause’s condition is true. If it isn’t, the ability is removed from the stack and does nothing. Otherwise, it continues to resolve. See rule 603.4.
September 30, 2011 · Innistrad
If a triggered ability has an intervening "if" clause, it checks whether the clause's condition is true. If it isn't, the ability is removed from the stack and does nothing. Otherwise, it continues to resolve. See rule 603.4.
June 17, 2011 · Commander 2011
If a triggered ability has an intervening “if” clause, it checks whether the clause’s condition
April 1, 2011 · Duel Decks: Knights vs. Dragons
If a triggered ability has an intervening "if" clause, it checks whether the clause's condition is true. If it isn't, the ability is removed from the stack and does nothing. Otherwise, it continues to resolve. See rule 603.4.
February 4, 2011 · Mirrodin Besieged
If a triggered ability has an intervening “if” clause, it checks whether the clause’s condition is true. If it isn’t, the ability is removed from the stack and does nothing. Otherwise, it continues to resolve. See rule 603.4.
October 1, 2010 · Scars of Mirrodin
If a triggered ability has an intervening “if” clause, it checks whether the clause’s condition
February 1, 2010 · Worldwake
If a triggered ability has an intervening "if" clause, it checks whether the clause's condition is true. If it isn't, the ability is removed from the stack and does nothing. Otherwise, it continues to resolve. See rule 603.4.