As MTG itself has aged, certain cards become more and more valuable to collectors with a value beyond how they are played
Naya is an allied shard all about creatures
Whether you play one, the other, or both, your Adventure deck is very likely to be aggressive at least all the current builds are and its going to be more resilient than most aggro decks, because both the build-arounds provide card advantage and the Adventure mechanic is in itself a source of it
Given the added utility of combat tricks in letting you ambush opposing Ring-bearers with a creature of lesser power (the only kind allowed to block them), Im going to value them more highly than usual
It actually features all three of the birds in the artwork if you look closely, so we don't mind that there wasn't a Special Illustration Rare of the other birds
You can open a support ticket with MTGA Support's web page, or from the Adjust Settings menu (upper right, looks like a gear), and then go to Report a Bug at the bottom