# Corrupted Key Corrupted Key represents an interesting artifact design from Magic's experimental playtest cards. Collectors value Mystery Booster Playtest cards as windows into Wizards' design process, showing mechanics and concepts that never made it to official sets. This particular card explores artifact-based lock strategies, appealing to players interested in control and combo-oriented gameplay. The nonfoil-only status makes variants straightforward for collectors tracking this release. Mystery Booster Playtest cards occupy a unique space in the hobby—they're legitimate Magic products with genuine rarity, yet they exist outside standard set releases. Collectors appreciate them for their design philosophy and historical documentation of the game's development, rather than competitive utility or traditional scarcity metrics.