Arthur Adams' animation work on 1985's Longshot miniseries:
Hulk animation is by Al Milgrom from The Incredible Hulk #292 - #300. Interestingly, this animation mirrors the story in the books of Bruce Banner's intellect losing controlling The Hulk.
Magik was a four-issue comic book limited series published by Marvel Comics in 1983–1984. The corner box artwork shows what happened while the character was in Limbo, aging and being corrupted by demons:
In 1988, DC's Power of the Atom series ends with a shrinking, (then disappearing) Atom on the covers! (This is the only instance I could find in DC books Unsurprising, since corner box art wasn't really their thing...):
Machine Man art by Barry Windsor-Smith from the 4 issue limited series (circa 1984) - it's not animated corner art, but rather animated cover art:
Dork Note: If anyone knows of any others please drop me a line.