Meeeaty - Some trick taking games are relaxing affairs. Play your highest card and hope for the best. In Ghosts of Christmas, there are multiple ways to approach each round and use brain cells.
Ripple Effects - When you don't have the cards to win in a straightforward way, sometimes you can engineer a change in who wins the "Past" trick in order to make the "Present" and "Future" trick work out better for you.
Dials - They're both fun and informative. A great visual way for everyone to keep track of which suit they can play to each ghost.
Different Variants/Difficulty Levels - If you want a more low stress evening (or you are just learning), play the variant without bidding. If you think you've mastered the game, try playing one of the TWO variants with the "Beyond" ghost that add even more options.
Bidding Options - Speaking of bidding, the ability to place an "exact bid" or a "wiggle room bid" gives you the option to play it safe or really go for that high score each round.