Rainmaker (noun)

1. A person or thing that creates or causes something to happen, especially something positive or beneficial.
2. A person who claims to be able to bring rain by means of magic or ritual, especially in times of drought.

Origin:

The word 'rainmaker' is derived from the native american practice of attempting to bring rain by means of ritual or dance. the word has been in use in english since the late 19th century.

Examples:

1. He was hired as a rainmaker for the company to help generate new business.
2. She was a rainmaker in the field of fundraising, bringing in millions of dollars for charity.
3. The rainmaker performed a dance to bring rain to the drought-stricken land.
4. The new CEO was called a rainmaker because of her ability to turn around struggling companies.
5. The rainmaker was said to have the power to make it rain by shaking a rattle.