A few additional points that could be added:
If you get VIP membership, then getting the Hearthstone treasure is REALLY useful since it will give you an ADDITIONAL trip to the tavern. So you can do as much damage as you want safely on the Plague Lord, and then use the Hearthstone. Gives your deck a boost and lets you try the Plague Lord again from where you left off with a fresh deck and hero.
For Ancient Reflections, a very strong combo (which is easy to pull off on the first Plague Lord) is using it on Old Murk-Eye (even if it's an enemy minion). It gives you a board full of
