Uncanny X-Men #256 (1st Psylocke New Costume)

Psylocke is recruited by Matsu'o Tsurayaba to join forces with the Mandarin and the Hand, a fierce clan of assassins. In exchange for her services, she is granted the ultimate gift - the power of an assassin. In a twisted and surreal experience, Psylocke is transformed physically and mentally, becoming a weapon for the Hand. She must face her own teammates and even her own identity as she attempts to acquire Mandarin's ten rings. However, it is eventually revealed that this was all part of a brainwashing experiment, and Psylocke must ultimately decide where her loyalties lie. With its gripping storyline and intense twists, this issue is a must-read for any fan of the X-Men.