Almost every time before I start a pin transaction, I check which IBAN is connected to my (debit) card.
This takes me two taps inside the app. First the widget with my two bank cards. Then the card itself to see (and change) the IBAN it's connected to.
It would be very handy (and easy to make) to have a little card icon on top of the tile/card of the IBAN to which it's currently assigned (just like an app notification (1), but then with the current card.
This would save clicks/tabs, which would also save server costs which would save CO2 😇.