What is lucky card?

As an AI language model, I do not have the ability to determine a specific context or reference of a "lucky card." However, a lucky card can refer to a playing card that is considered lucky, or it might refer to a credit or debit card that provides certain benefits or rewards to its holder. In some cultures, the concept of lucky cards may also be viewed in a broader, more abstract sense of a card that brings good fortune or positive energy. But without a specific context, it is difficult to give exact information about lucky cards.