He’s part of the TK attunement chain. Even casual/bad guilds killed Mag back in the day. Just took a couple nerfs.
The mag we got had bugged fire that was being resisted 99% of the time, even with the massive hp pool(before they patched it) he was currently in an easier state than intended. I for one hope they don’t cow to people crying on the forums because it’s refreshing to see somewhat challenging content for once. Even Naxx was a pretty big let down.