Reason For: Could Not Reproduce
The Brazen Borrower from the Special Guest set renders as intended on our side. Did you try and clear the MTGO cache? You can clear the cache by closing the client and deleting the files in this folder:
C:\Users\[YOUR USER NAME]\AppData\Local\Wizards of the Coast\Magic Online\Images\Cache
Simply replace the [YOUR USER NAME] part of the path with your PC's name.
Hopefully this fixes your issue.