Not exactly a magazine but its close. Here's a scan of the cover of the American Entertainment comic book catalog issue #29 featuring a Rai and the Future Force cover. American Entertainment was a comic book retailer who would publish a quarterly catalog of their in stock comics with prices.
I've never seen this artwork before and can't place the illustrator but it's not likely to be one of the bigger names as the art is not the best.
Credit to SonicDan's Valiant site for the source image.