Shellos, a Common rarity Reverse Holofoil card from the XY - Steam Siege set, is designated as card #28/114. With its current market value at $0.31, it appeals to collectors looking for affordable additions to their Pokémon card collections. As part of the Steam Siege expansion, Shellos features unique artwork and plays a role in various deck strategies, making it a notable piece for both casual players and enthusiasts alike.