If you research subliminals that are commonly used on Youtube or other places, you find some fear mongering. So many people think “This person charged their subliminal with a magic spell, that is so scary and has negative consequences.” Obviously these people are not magicians. They also say that after using a subliminal, they saw shadows and evil spirits but I will explain why this happens.
When you are using a subliminal that is charged with a magic spell, it causes you to benefit both from the spell and the affirmations put into the subliminal. But benefiting from magic or having magic in your life causes you to light up energetically. This is safe if your ancestors are protecting you or you have a spirit companion, guardian demon/angel to protect you from negative energy. For the people who claim a subliminal caused them to see ghosts, I suspect that this comes from a lack of ancestral protection. Although even when these things do happen they are not too bad, like windows opening by themselves or toys floating in the air. Some florida water or sage will stop it from happening.
I have personally used subliminals charged with demonic energy, and sometimes I wish I saw demons, shadows, and all the other scary stuff everyone else got. Being so protected means I don’t ever see those things. You can even find subliminals online that are charged with the energy of demon companions.
Are they dangerous? A little bit, if you don’t know what you’re doing and you’re not protected. If you want to be a magician you need to stop being scared of ghosts and spirits because you’re going to be talking to them a lot. When you first start working with demons or other spirits you will smell sulfur and it can be overwhelming, but you’re not going to die unless you call some god of death or the wrong deity.