Heal your friends!
Curse your enemies!
And never cast a single legitimate spell!
That's right. With the Manipulative Player's Guide to Sympathetic Magic, you can take the real world concept of "mind over matter" and turn it on its head. This 7 page PDF has the complete rules for using Sympathetic Magic for your own underhanded purposes.
Learn what Sympathetic Magic is. Get the rules for faking spells. Learn how to bestow curses on unsuspecting enemies. Trick demons into leaving their hosts by performing a fake exorcism (um, but don't try that at home).