You can play the Mystic jackpot with a Prophecy Stone or some Gold. If you draw three of a kind, you’ll win one of that particular item; five of a kind, and you’ll win all five of them. If you draw five Mystic Jackpot Beakers then you’ve hit the Jackpot and a notification will appear in-game for all Kingdoms!
Note: Every time a Lord plays, a proportion of the Gold used is added to the Jackpot total. The more Lords that play, the bigger the Jackpot you’ll have a chance of winning!