rainmaker

noun

1. a person who tries to make rain fall; specif.,
   1. a North American Indian medicine man using rituals to influence the rain gods
   2. Informal a meteorologist or aircraft pilot involved in seeding clouds or the like
2. ☆ Slang
   1. an influential person who can bring success or new vigor to an enterprise
   2. a person, esp. an attorney, who attracts new clients or business to a firm, practice, etc.