Union Arena's Attack on Titan release marked a significant moment for anime trading cards in the mid-2020s. As the TCG market diversified beyond traditional games, Union Arena established itself as a premier vehicle for anime properties, drawing both longtime card collectors and anime enthusiasts into the hobby. The set's ambitious scope and alternate art treatments helped legitimize anime cards as serious collectibles. The Armored Titan alternate art showcases one of the series' most iconic and visually striking Titans. This card captures the character's imposing design and strategic importance within the narrative, making it particularly popular with both collectors who appreciate the artwork and those building competitive or thematic decks around Attack on Titan's most memorable forces.