I've been running with Black Ox Brew since basically legion launch, but I've read on the US forums quite a few people suggesting Gift of the Mists for mythic and mythic+ dungeons.
I tried it in a few heroic dungeons where it didn't seem to do anything really (even with the healing being one of our dps in heal spec, without talents even, so I was hovering around 60% health most of the time)?
Have any of you guys had success with Gift of the Mists in mythic dungeons? I'm getting hammered quite hard in them, spending quite some time at 30-40% health so more healing would be nice there but I'm not sure about the randomness of it in +dungeons.