Q: With promo cards or the expansion added in to Get the MacGuffin, the cards will deal out completely with some group sizes. Is there still a Tomb?

A: There should always be a Tomb. If your Get the MacGuffin deck is not a prime number of cards for some reason, simply start the Tomb with one card, then deal out the rest of the deck as evenly as possible, and take the remainder and add them to the first set-aside card to form the complete Tomb.