The concept consists of using new cards rather than simply adding onto the previous set of cards with every Omega RP, however some cards have been in multiple RPs.
The cards are based off characters who are mostly not present within the RP although there are a few exceptions. In Omega Destruction the card game consisted of 25 cards plus a secret card, the cards were all based off characters either living at the present time or from Seven Heroes era. In Omega VI: Revelations consists of cards based off characters from past Omega RPs, future Omega RPs as well as a few characters from the Seven Heroes era. Omega VII: Dark Delusion is expected to be based heavily off characters in Omega V: Redemption and Omega VI: Revelations however a few cards from Omega VI's card game will be in.
 - Refers to a rare card variation in addition to having a normal card.
 - Refers to a rare card variation yet lacks a normal card.