If a triggered ability’s trigger condition is met, but the object with that triggered ability is at no time visible to all players, the ability does not trigger.
July 23, 2021 · Adventures in the Forgotten Realms
Some trigger events use the word “becomes” (for example, “becomes attached” or “becomes blocked”). These trigger only at the time the named event happens—they don’t trigger if that state already exists or retrigger if it persists. An ability that triggers when a permanent “becomes tapped” or “becomes untapped” doesn’t trigger if the permanent enters the battlefield in that state.
July 3, 2020 · Core Set 2021
If a triggered ability’s trigger condition is met, but the object with that triggered ability is at no time visible to all players, the ability does not trigger.
May 3, 2019 · War of the Spark
An ability triggers only if its trigger event actually occurs. An event that’s prevented or replaced won’t trigger anything.
January 25, 2019 · Ravnica Allegiance
An ability triggers only if its trigger event actually occurs. An event that's prevented or replaced won't trigger anything.
February 1, 2014 · Born of the Gods
An ability triggers only if its trigger event actually occurs. An event that’s prevented or replaced won’t trigger anything.
September 30, 2011 · Innistrad
An ability triggers only if its trigger event actually occurs. An event that's prevented or replaced won't trigger anything.
June 17, 2011 · Commander 2011
An ability triggers only if its trigger event actually occurs. An event that’s prevented or
April 1, 2011 · Duel Decks: Knights vs. Dragons
An ability triggers only if its trigger event actually occurs. An event that's prevented or replaced won't trigger anything.
February 4, 2011 · Mirrodin Besieged
An ability triggers only if its trigger event actually occurs. An event that’s prevented or replaced won’t trigger anything.
October 1, 2010 · Scars of Mirrodin
An ability triggers only if its trigger event actually occurs. An event that’s prevented or
February 1, 2010 · Worldwake
An ability triggers only if its trigger event actually occurs. An event that's prevented or replaced won't trigger anything.