An ability that reads “Whenever [a player] attacks with [a creature], . . .” triggers if a creature that player controls is declared as an attacker.
May 3, 2019 · War of the Spark
An ability that reads “Whenever [a player] attacks with [a creature], . . .” triggers whenever a creature that player controls is declared as an attacker.
January 25, 2019 · Ravnica Allegiance
An ability that reads "Whenever [a player] attacks with [a creature], . . ." triggers whenever a creature that player controls is declared as an attacker.
August 25, 2017 · Commander 2017
An ability that reads “Whenever [a player] attacks with [a creature], . . .” triggers whenever a creature that player controls is declared as an attacker.