# Priority Avenger Priority Avenger represents an interesting artifact from Magic's design process. As a Mystery Booster playtest card, it exists in a unique category—never intended for actual release, these cards document Wizards' experimental mechanics and balance testing. Collectors value playtest cards for their historical significance and rarity. Priority Avenger's appeal lies partly in its obscurity; playtest cards generate curiosity about what made it into final sets and what didn't. The nonfoil-only status limits supply further. Collectors typically appreciate these cards as windows into game development rather than competitive staples, making them niche but meaningful additions to collections focused on Magic's design history and behind-the-scenes artifacts.