Hey Mark! My wife and I are building constructed decks from the Marvel universe, but I am trying to decide if we should limit ourselves to standard-legal cards, or if we should allow ourselves to use the entire library including eternal-legal cards (MSC) as there are characters/events in MSC that are exciting, but I fear that using them may create significant play balance issues. Are there convincing gameplay reason we should limit ourselves to MSH cards (beyond just “they are standard legal”)? Are standard-legal and eternal-legal cards balanced against each other at all? Or is the distinction primarily due to the need to create a set around limited play?

I would use any card with the property on them.