Just an update. I tried UD again for a checklist and here was my reply:
Upper Deck has not published a list of which writers did autograph cards or which artists did sketch cards in Marvel Masterpieces 3. There is also no information on the quantities of each writer autograph card or artist sketch cards. There are no plans at this time to release this information or publish a list like this on our website.
We are very sorry about this inconvenience. If you have any further questions please let us know.
Game Support Representative
Upper Deck Entertainment
PC Jake Fisher - If I don't have it, I want it!
Looking for Doctor Who Battles in Time, Doctor Who autographed index cards and Solomon Grundy