Nurse of Holdheart

/:When placed from hand, 1, and swap a unit card from your hand with a card from your damage zone. If you put a grade 0 card into your damage zone, choose up to one of your opponent's rear-guards, put it into his or her damage zone, and if your opponent's rear-guard was put into his or her damage zone, your opponent chooses a card from his or her damage zone, and heals it. (Put the swapped cards face up)