To many magicians and cardists and even some collectors, "Sybil" is synonymous to the famous card flourish that has become the basic foundation to many cardistry techniques today. It was the inspiration to the Oracle Cut created by Erik Mana when the Oracle deck was first launched. And you can see the Oracle Cut being performed in the Joker card of the Oracle deck.
But in ancient times oracles went by a different name...Sybil. Sybils were know as prophetess and were regularly sought out for divine advice. Playing cards too have divine elements and have been used in divination and magic for centuries, which is why the Oracle & Sybil decks will always have a special kinship in it's design.