) Cards can only be challenged by an opponents card when exerted - turned sideways, like tapping in MTG - after fighting, questing or using a specific ability, meaning that theyre not at risk until you use them
These could all be in the Illuminary
We already had the much maligned board wipe of Be Prepared, the classic Dragon Fire for targeted removal and recently Lady Tremaine has been forcing players to banish one of their own characters when she enters play, even getting around ward effects
After questing, Rapunzel picks one of your opponents characters and says, No questing for you! And since shes Evasive, unless your opponent has their own floaty-footed friends, shell just keep questing away
He was so potent he received a developer errata to increase his cost and restrict his ability in order to level the playing field