Volume 1 #17 (Polybagged). "Sleeping with the Enemy (X-Cutioner's Song, Pt. 8)"
Marvel Comics. December, 1992.
Writer(s): Fabian Nicieza
Artist(s): Greg Capullo, Harry Candelario
Notes:
Sealed in polybag; includes Mr. Sinister trading card
Appearance: X-Men, X-Factor