Mage Tower Appearances
Okay, so you want one of the Artifact appearances available from the Mage Tower single-player challenge — and though it was introduced in patch 7.2, it's possible you've put it off until the last minute.
Of all the possible activities players can work on completing before Battle for Azeroth's release, the Mage Tower challenges have been the most popular.
Recently, the players learned the Artifact appearance from completing a Mythic +15 keystone would be available in Battle for Azeroth.
The Mage Tower was up once again last week, and I couldn't help but notice several people tweeting out their newly unlocked appearances -- in many cases, for more than one character or spec.