The reason both mysteries are used do begin with is so that you can do more useful stuff with your other ninjas. the 0 cost is needed to compete with 2nd turn teams, like LB teams. The heal/debuff clean, by itself, does nothing. You HAVE to be able to follow-up. So what if I heal the damage/CC if I can't properly respond after that? Aggressive teams just won't care and deal the additional damage.
Any non-zero cost will force the player to choose between a support Mystery that does nothing to teh opponent or a sub-optimal Mystery (ex. Healing Chojuro does me no good if he won't be able to cast at the same round). This post was last edited by Mitrandir at 2017-4-18 17:36