Elegua is the warrior who sits at the crossroads of every decision we make. He's the protector of the path. He's the gate keeper. Lay Elegua an offering of Gin and/or Tobacco and write your petition. He'll do the rest.
Double Reverse is a personal favorite. Whenever I'm not feeling well or I know someone is directly negative energy towards me, I light one of these. I write a petition with their name(s) on it, tell The Ancestors to "send it back" 10x- whatever it is. Fold petition and place under the candle, and the candle does the rest. You'll see the results.