I found 3 and 5 anyone seen any others? They are divine items that look like demonic heads if that helps.
I have one of the 2nd Circle ones. There was another one in in the shop a few days ago, but I forget what level it was.
They look awesome. I plan to dedicate my priest totally to these dark paths (Healing is for gimps! We want card advantage for life!) Just like in the old days!
I now have Charms of the 2nd 5th and 7th Circle. Not equipped any yet, will have to test them out soon.