Loved the guide on Ahn'Quiraj one of my favorite classic raids. 

Since this was inspired by Classic WoW redoing the gate opening event perhaps the coming Shadowlands expansion would inspire a look on the darker side. The Lich King is such an important character. While he had his debut in Hearthstone I can see him making multiple appearances, much like Deathwing.

Or go deeper and explore death itself. In WoW characters die a lot. Some get resurrected, some become ghosts, some become forsaken. Many entities have their hands in death (Spirit healers, Loa like Bwonsamdi, Val'kyr). 

I also enjoyed your look at the cards themselves and how well they matched the theme/lore. The same could be done for other sets such as the Loa or shrines in Rastakan's Rumble. 

With a set coming soon I am sure you'll have plenty to talk about. Still just leaving some ideas for the future. I look forward to reading your work.