While you could do a tarot ritual, I would first suggest you get some kind of counseling. Obviously, you aren't going to be able to get them to come with you, but if you go alone, you'll get some helpful suggestions about how to handle the two women in your life.
Failing that, I would sit them down together or separately and tell them you won't put up with their back-biting anymore. If they can't get on, then you will have to keep them well apart. You also have to tell each that if they moan/rant/nag about the other you will simply walk out of the room. Explain that it's causing you stress and anxiety and making your life a misery.
You have to express how you feel, and you have to make sure they understand that you will not tolerate such immature behavior.
If you really want some sort of magical solution, I think Switchwords might be helpful: https://exemplore.com/misc/How-To-Use-Switchwords
Together, Together Rejoice, Together Between, Together With would be the most useful for you.