Worked on the magefree/mage repository to enhance the stability of card interaction logic within a Java-based card game engine. Focused on resolving a critical bug involving Bello, Bard of the Brambles and its dependency handling with cards like Ashaya, Soul of the Wild, the developer corrected the underlying logic and reinforced the solution with targeted regression tests. Comprehensive unit tests were added to cover Bello’s interactions with artifacts, enchantments, and overlapping effects, increasing the reliability of future changes. Emphasized robust test coverage and continuous integration practices, leveraging skills in card game logic, game development, and unit testing throughout the process.