Ever since silver cards disappeared, tutors like Fringilla Vigo, Keira Metz and even the leader Francesca Findabair can (re)play the most powerful gold legendary special cards or spells, like for example Korathi Heatwave, Royal Decree, Renew, and Hanmarvyn's Blue Dream. This seems not well balanced and was not possible before HC. Therefore my suggestion is to implement silver cards again, allowing for better balancing of card interactions and creation of more specific card interactions with future updates.