All of this cycle of triple-class cards are good if you're strapped for cash or need the skill boost if you have a good chunk of cards from any one of the particular traits listed. Most Mystics are intrigued because probably half of your deck is made of Spells, and boy, Spells are expensive! Robes of Endless Night kind of works in a similar fashion at level 0, and this is quickly becoming a staple for Mystics. But for one Mystic in particular, Father Mateo, you should get a discount for your non-Spell cards, too:
Spirit cards: in , right now there are only two non-Spell Spirit cards: Meditative Trance and Winds of Power. For the former, if you're otherwise not spending the resources that round, 0 cost to heal is not terrible, but Winds of Power is definitely worth the look. Outside of this, there is A Watchful Peace, which is already pretty cheap, but every resource counts!
Fortune cards: The main attraction. Father Mateo can take six Blessed cards that have the Fortune trait that cost any resources. A Glimmer of Hope is not worth your time here, but a free Eucatastrophe or Keep Faith is absolutely worth it. Playing Harmony Restored for only 1 resource might even be viable, especially if you're running Tempt Fate! Fortune or Fate and Shrine of the Moirai round out the set for now.
Calvin Wright is another interesting candidate due to his access to Spirit cards and affinity for Fortune cards. He even has access to a few non-Spirit Spells: Alter Fate, Enchanted Bow, and Earthly Serenity. Of course, all of the main class Guardians/Mystics/Survivors with one of the other classes as their off-class will think about this card, too -- I think in particular Patrice Hathaway will be using Spells and Fortune cards all over the place and can use the discount.