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.
Ba'al Zabub, Ba'al Zvuv or Beelzebub, also spelled Beelzebul or Belzebuth, and occasionally known as the Lord of the Flies, is a name derived from a Philistine god, formerly worshipped in Ekron, and later adopted by some Abrahamic religions as a major demon. The name Beelzebub is associated with the Canaanite god Baal.
Source: en.wikipedia.org/wiki/Beelzebub