Franchise context: The write-up below is from the parent franchise article (anime, book series, or IP) rather than the card game itself. A dedicated CCG profile has not been written yet.
Oligarchy is a form of government in which power rests with a small number of people. Leaders of such regimes are often referred to as oligarchs, and generally are characterized by having titles of nobility or high amounts of wealth.
Source: en.wikipedia.org/wiki/Oligarchy