Tag All Stars arrived in 2019 as a premium Japanese set celebrating TAG TEAM GX mechanics, a cooperative battling format that defined the era. These dual-character cards became central to competitive play and collecting culture, representing the height of the TAG TEAM era before the format's eventual rotation. The set's focus on iconic partnerships and striking full-art treatments made it highly sought after by both players and collectors building comprehensive Japanese collections. Keldeo GX showcases the mythical water-type Pokémon alongside its TAG TEAM partner in dynamic artwork characteristic of the set's quality. Collectors appreciate this card for its representation of Keldeo's competitive relevance during this period and the beautiful illustration work TAG All Stars became known for. It remains a standout from the set's Double Rare lineup.