There is no offical list as far as I know, but this Youtube series- https://www.youtube.com/watch?v=04kyBHijkRI identifies a number of them for the Marvel Universe 1990 set. The primary artist was mark Bagley, with work by Art Adams and Alan Davis, I believe. The DC series aroudn the same time actually has the artist listed in very small print onthe back of the card. There are separate pcitures on the backs of those DC cards, though, and I talked to artist Nelson De Castro who said he drew a numebr of those uncredited. I hope this helps. It's definitely frustrating tyring to figure out who some fo the artists are when they are not named, though.