You can look up what a complete set of Marvel cards is worth… just search like this “2011 Marvel Beginnings Series 1 Set“. You might have to play around with the search… start with fewer details to search more broadly, then add more details to narrow it down. Good luck!

The sketch cards tend to be worth the most money. They are hand drawn art signed by the Marvel artist. For example… check out the prices people pay for the sketch cards.

Hmm… hard to find an example of this misprint card… must be sorta rare. I did find one card that sold recently and a handful that are currently for sale here: https://mavin.io/search?q=1990+Marvel+Thing+Hulk+88&bt=forSale But I didn’t find any listed as a misprint. Might be worth sending in to get graded/authenticated. I’m not too sure what the market is for these type of misprint cards.