Kamiya

 Sefer Chasidim (1114) If a scholar, whether a non Jew or Jew, says he will write a Kamiya for you so that you are favored by others or that your words be accepted or that you find favor in the eyes of the leaders or that you become wealthy obviously this is prohibited to carry on Shabbos but it is also prohibited on weekdays because you are trusting this nonsense and one should rely whole heartedly in G-d. 

Rabbeinu Yona (Shaarei Tshuva 03 104) In their practices (chukim) do not go – we are being warned by this  to stay far away from darchei Emori as well as incantations or amulets which have not been shown to work for  medical problems