2021-09-24 : Although the Human tokens created by the triggered ability are attacking, they were never declared as attacking creatures (for the purposes of abilities that trigger whenever a creature attacks, for example).

2021-09-24 : Attacking with any creatures will cause Adeline's last ability to trigger. Adeline doesn't have to be among them.

2021-09-24 : The ability that defines Adeline's power works in all zones, not just the battlefield. As long as Adeline is on the battlefield (and still a creature), that ability will count Adeline itself.

2021-09-24 : Tokens will be created for each of your opponents, not just opponents that you attacked.

2021-09-24 : You choose whether each token is attacking that opponent or a planeswalker they control as those tokens enter the battlefield.