Any effects that say that the Bird can't attack (such as that of Propaganda) affect only the declaration of attackers. They won't stop the Bird token from entering the battlefield attacking.
23-06-2020
wotc
You choose which player or planeswalker the Bird token is attacking. It doesn't have to be attacking the same player or planeswalker that Falconer Adept is attacking.
23-06-2020
wotc
Although the Bird is an attacking creature, it was never declared as an attacking creature. This means that abilities that trigger whenever a creature attacks won't trigger when it enters the battlefield attacking.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.