I would try running Bring it On / Shield in a Control deck. Use it mid to late game to block your opponents creatures and keep yours safe for a turn or two.
As for Thariel's Scale, I'm not too sure about that one. Sure, there are times where it could be a useless 7 mana card, but there are other times would it could just be an extremely frustrating, toxic play. I think there needs to be some sort of negative side to it (aside from mana cost), though I dont know what that would be. Maybe something like ' Destroy your God Power'? But then it might an extra buff. Perhaps give Ward and/or Protection?
Yeah, well if you time it right it could work in Control deck too, but I was thinking more of it as an aggro card just because there will always be something to protect.
Hmm, in my eyes the card has a built-in negative side. As you said, sometimes it will just be a useless expensive card.
I'm not sure why, as you can play around it and if your opponent decides to play it, let's say for the original cost of 7 mana, they won't have any mana left to clear your board or summon creatures to defend.
Healing yourself for 10 while reducing your opponent's health by a lot, does sound powerful but in that scenario it's more than likely you are already losing on the board and you don't have time to play it.
Thanks for your thoughts!