As it stands, I think having Diagnosis and Prognosis, as well as their Eukrasian counterparts, works well as a passable source of healing when there's no enemy to target, such as during a phase change, and they shouldn't also trigger Kardia because the whole point of SGE is to avoid GCD heals like the plague more than any other healer. You're not supposed to want to even think of using those tools when an enemy is present. However, the potential of Kardia is really lacking. Like with what AnotherPerson said at the beginning, SGE should've had a wider selection of offensive spells that apply different effects to your Kardia target.