You have to completely eliminate the purification skill in the equation, because it is a useless skill that does not increase the damage at all and place a skill that while that bonus card of the set is equipped, the skill has those functions to give DPS to the darklord,
Purification is only a skill to use in Darklord Tank mode and if it is used when in DPS it would be to remove status effects and not increase MP recovery because the other Attact order skill would already be performing that recovery function