As usual, I cannot find the site to order the pre-printed cards, but this is a link to the prayer.
Spiritual Warfare Prayer. As I said, it is not for the light of heart, this is getting serious, not an exorcism, but headed in that direction. (Note: the paragraph that starts In the Name of Jesus, I rebuke should be repeated 3X as well. It does not say that, but Fr. De Grandis taught us that)