Union Arena's Attack on Titan release marked a significant moment for the TCG line, bringing Hajime Isayama's acclaimed manga and anime series into the collectible card game space. Released in 2025, this set captured the franchise during its final story arc, appealing to both longtime fans and newer collectors discovering the series through its concluded anime adaptation. Eren Jaeger as the Attack Titan represents one of the set's most iconic character cards, featuring the protagonist in his transformed state—central to the story's mythology and visual identity. Collectors are drawn to this Super Rare for its pivotal character significance and the dynamic portrayal of one of anime's most compelling and complex figures.