An OCG-only card is a card currently released in the OCG, but not the TCG. At any given time, there are likely to be several hundred OCG-only cards; most of them are from core Booster Packs and other products that normally get imported directly to the TCG shortly after their OCG release.
OCG-only cards can be eventually released in the TCG through a number of different methods, such as in Booster Packs, in a Gold Series, or as other types of promotional cards.
- Cards the OCG has the TCG doesn’t (yet), a list on YGOrganization of OCG-only cards divided by card type and excluding cards that are likely to be imported in a TCG version of their debut set (e.g. core boosters cards).