The odds are extremely low so these cards are bound to be some of the most expensive non-chase cards in the game
Omega debuted in Final Fantasy 5 as one of two super-powerful bosses that were even stronger than the main villain
Final Fantasy games often have this sort of dynamic, with a Light and Dark entity, or Order and Chaos, etc., and Zodiark is meant to represent the dark aspect of things
However, a number of significant battles occur at Orbonne Monastery, such as the opening tutorial, a few sequential battles midway through the game, and then returning there at the end of the game, where you're taken to the Necrohol of Mullonde, the true final area of the game
This deck works pretty well right out of the box by just giving you a ton of characters to work with, relying less on complicated combos that are unlikely to work in a starter deck format, anyways
This means they are generally more difficult to deal with compared to characters