House ad for Legion of Super-Heroes v.4 #8 (June 1990); printed in [Batman:] Legends of the Dark Knight v.1 #7 (May 1990)
Ad art based on the cover of LSH #8:
Left side: pencils by Curt Swan, inks by Murphy Anderson and Al Gordon. Right side: pencils by Keith Giffen, inks by Al Gordon. Colors by Tom McCraw.