The Mage Tower will be coming up again soon, along with another chance to earn the Serpentbite appearance for Titanstrike through the challenge scenario. It goes perfectly with our brand new sneaky snakes, don’t you think?
I just posted a guide to the Beast Mastery challenge on Wowhead that will hopefully help you complete this challenge. It has recommended gear, talents, macros/weakauras, and a full guide to the encounter.
The Beast Mastery one is a little less gear dependent than some of the others (at least in terms of item level), but healing legendaries make a huge difference here. Most people who complete it seem to have at least 1 of the 3 healing legendaries. I would have made a video, but unfortunately you can’t repeat the scenario once you’ve complete it (I didn’t know at the time).
Hope the guide helps. Good luck!