Shadow of the Blue Sea represents a significant moment in Chinese Pokémon TCG expansion history, released during the modern era's surge in international market growth. This set exemplifies the increasingly sophisticated approach to card design and special rarity treatments in contemporary releases, with Art Rares becoming a defining feature that elevated visual presentation and collector appeal across the board. Miltank's Art Rare illustration captures the character in an expressive, detailed composition that showcases the artistic potential of the full-art treatment. Collectors seek this card for both its charming subject matter and the technical quality of its illustration, making it a notable pull from booster boxes during the set's release window.