It's silly strong and I love it. Greedily I'd love to see some mechanic that lets go oGCD on a rare / slow rotation or gives us reason to use it without hurting healer's feelings (maybe after X oath spent = 1 free oGCD clemency). Perhaps more unique is by using it once in your magic rotation causes your next Y attack to have improved effect (maybe a new interaction with a shield attack, clemency and judgement- once per magic cycle it'll add one judgement bolt). Which is some holy shield cannon you have to load up before you ion Zeus Yamato cannon blast out of your shield, a skill that is worth but had to be charged over multiple rotations through clemency.