# Krosan Adaptation Krosan Adaptation represents an interesting footnote in Magic's design history as part of the Mystery Booster Playtest Cards 2021 set. This collection featured experimental mechanics that Wizards tested but ultimately didn't print in standard sets, making these cards inherently speculative in nature. Collectors view playtest cards with mixed interest. They're appreciated by those who enjoy design history and alternative versions of mechanics, but they lack the legitimacy of officially released cards for most players. The nonfoil-only printing limits appeal compared to foil variants. These cards occupy a niche space—too unconventional for competitive play, yet interesting enough for casual collectors and design enthusiasts who value seeing what might have been.