When playing a card in the Trash with Necromancer and using it as a Way, the art on the card in the trash permanently changes to the Way's art when right-clicked in the Trash, when viewed via right-clicking on Necromancer (if it's a Zombie), and in the Necromancer UI (when you play another Necromancer). Later playing the Action as itself does not revert the art.
Game 37699420 (Way of the Horse)
Game 37699858 (Way of the Pig)
I don't expect that this would be system-specific, but in case it is, I'm on a Mac using Firefox.