This is literally exactly the same as casting a curse. The three fold law is Wiccan dogma not a law of physics, so there is not bad karma for cursing. This is not even how karma works. Stop being holier then thou!
Pure Reiki Healing - Cleansing Chant Amazing Secret Discovered by Middle-Aged Construction Worker Releases Healing Energy Through The Palm of His Hands. Cures Diseases and Ailments Just By Touching Them. And Even Heals People Over Vast Distances.