Gengar is a card from the Pokémon Japanese Old Maid set, classified as an Unknown rarity. With a current market value of $17.58, it holds a niche appeal among collectors, particularly those focused on vintage Japanese cards. Its unique design and association with the Ghost-type Pokémon enhance its desirability, while its rarity status contributes to its market presence. Collectors often seek this card to complete sets or as part of thematic collections.