Worked on the magefree/mage repository to address a critical bug affecting combat-triggered abilities in card game logic. Focused on ensuring that Nahiri, Forged in Fury’s triggered ability activates only when the equipped creature attacks, rather than all attacking creatures. Applied Java to implement the fix and expanded unit testing to include regression tests, improving reliability and preventing future issues with similar combat interactions. Enhanced the traceability of code changes to support clearer audits and reviews. This work contributed to more robust game mechanics and reduced support overhead, demonstrating a methodical approach to game development and quality assurance practices.