If the effect that states a creature is attacking specifies it’s attacking a certain player, and that player is no longer in the game when the effect resolves, the creature doesn’t become an attacking creature. The same is true if the effect specifies a creature is attacking a planeswalker or battle and, when the effect resolves, that permanent is no longer on the battlefield, is no longer a planeswalker or battle, is a planeswalker that is no longer controlled by a defending player, or is a battle that is no longer protected by a defending player.
April 14, 2023 · March of the Machine
If the effect that states a creature is attacking specifies it’s attacking a certain player, and that player is no longer in the game when the effect resolves, the creature doesn’t become an attacking creature. The same is true if the effect specifies a creature is attacking a planeswalker or battle and that permanent is no longer on the battlefield or is no longer a planeswalker or battle when the effect resolves.
August 23, 2019 · Commander 2019
If the effect that states a creature is attacking specifies it’s attacking a certain player, and that player is no longer in the game when the effect resolves, the creature doesn’t become an attacking creature. The same is true if the effect specifies a creature is attacking a planeswalker and that planeswalker is no longer on the battlefield or is no longer a planeswalker when the effect resolves.
May 3, 2019 · War of the Spark
A creature that’s put onto the battlefield attacking isn’t affected by requirements or restrictions that apply to the declaration of attackers.
January 25, 2019 · Ravnica Allegiance
A creature that's put onto the battlefield attacking isn't affected by requirements or restrictions that apply to the declaration of attackers.
August 25, 2017 · Commander 2017
A creature that’s put onto the battlefield attacking isn’t affected by requirements or restrictions that apply to the declaration of attackers.
September 30, 2016 · Kaladesh
rule 508.4b not present in this release
July 22, 2016 · Eldritch Moon
A creature that’s put onto the battlefield attacking isn’t affected by requirements or restrictions that apply to the declaration of attackers.