Union Arena's Attack on Titan release brought anime trading cards into the mainstream collectible market during a period of explosive growth in the hobby. The 2025 set captured one of anime's most influential series at peak cultural relevance, introducing alternative art versions that elevated card design beyond traditional portraits. These alternate illustrations became defining releases for collectors seeking premium artwork and creative interpretations of beloved characters. Jean Kirschtein's alternate art treatment showcases the character with dynamic new visual presentation that diverges from standard card imagery. Collectors pursue alternate art cards for their artistic merit and scarcity compared to base versions, making them central to building comprehensive collections of key characters from the franchise.