5 Jul 2024
Although the tokens created by the third chapter ability enter the battlefield attacking, they were never declared as attacking creatures. Abilities that trigger whenever a creature attacks won't trigger when they enter the battlefield attacking.
5 Jul 2024
You choose which player, planeswalker, or battle the Assassin tokens are attacking. Each Assassin token can enter attacking a different player, planeswalker, or battle, and they don't need to be the same ones that the Assassins you control are attacking.