Rule evolution
Rule 508.3b
Earliest archived Rules release: 2017-08-25 · 1 wording revision · 0 renumberings
Added508.3bDetails
An ability that reads “Whenever [a player or planeswalker] is attacked, . . .” triggers if one or more creatures are declared as attackers attacking that player or planeswalker. It won’t trigger if a creature is put onto the battlefield attacking that player or planeswalker.
Wording changed508.3bDetails
An ability that reads "Whenever [a player, planeswalker, or
planeswalkerbattle] is attacked, . . ." triggers if one or more creatures are declared as attackers attacking that player orplaneswalkerpermanent. It won't trigger if a creature is put onto the battlefield attacking that player orplaneswalkerpermanent.