Four sets of Monster Cards were released for 1st edition Advanced Dungeons & Dragons in 1982.
The art is the draw for me. Erol Otus, Bill Willingham, and others. TSR was notorious for recycling its art over and over throughout various products. But this wasn’t the case with the monster cards.
More information over at our Reference Site (http://www.waynesbooks.com/Accessories.html#mcards).
Reading through Dragon Magazine, issue 61 (May 1982), on pages 52 & 53 I was delighted to see the cards from all 4 sets shown. Makes a great reference.