Wiccan, Satanic, Pagan, voo-doo etc.?

Someone did something unforgivable to someone I love. I want them dead pretty much, or close to it. I decided my first plan of attack was to see it magic was real. May as well give it shot, right? Which of these would allow me to harm someone without causing harm to me or anyone but the person I intend to harm? I don't wanna sell my soul or anything (haha). I honestly don't believe in god(s) at all but I'm willing to try anything.