Many years after this ad first appeared, I realized in retrospect it was done by Neal Adams.

From this collection of 1975-1982 or so Saturday morning ads, Adams did ads for at least 1975, 1976, 1978, and possibly 1980 season line-ups(the NBC 1980 ad looks a lot like Adams' 1967-1968 BOB HOPE and JERRY LEWIS issues for DC).

I especially enjoyed seeing Adams' rendition of the Warner Brothers characters.