You will invite spiritual warfare into your life. Spiritual warfare is a long game, not a cool ghost telling you your future like the Ouija board implies. It will instead be a long process of cars breaking down, bad health, complications at work, pets dying etc. Because bringing it in your house is stating spiritually "fuck it, I think Ouija board demons are cool so I'm gonna put it on my wall" so the Ouija board demons will come whether you use it or not. Because you made a covenant with it simply by admiring it.