This research explores player motivations in first-person shooter competitive multiplayer games and proposes game mechanics illustrated in gameplay contexts that promote competence, relatedness, and autonomy. By adopting a self-deterministic lens for exploring player motivations and experiences, and how they are negatively affected by toxic play, the study aims to identify insights that could diminish the negative effects for standard players. Following a design-based research approach, the project employed player-centred methods to explore personal accounts of experience in the researched context. The end result is an annotated portfolio presenting game mechanics in gameplay contexts that allow players to understand who they are playing with and against, to bond with their teammates, and to get a second chance to rejoin the game. The annotated portfolio frames the knowledge contribution as insights into how the designs enhance perceived competence, relatedness, and autonomy.