Finally, a spell for Mystics that compresses Investigate actions and doesn't run the risk of flubbing your whole turn. I think most mystics will prefer this over Rite of Seeking for two reasons: 1) There are generally fewer and +1 or 0 tokens in the bag than there are bad tokens, and 2) Taking 1 horror is a thousand times better than losing all your actions for every single mystic. Big winners here are Agnes, who can ping baddies while also picking up clues, Marie, who appreciates not losing her extra action in addition to her whole turn, and Jim, who can occasionally avoid the horror by treating the as a and who can clear horror with his trumpet. Agnes in particular pairs this with Shrivelling to get extra damage whether she fights or investigates, as long as your draws are good/bad enough. I think this is a very strong card, and is significantly better than Rite of Seeking. Can't wait to use it.
Taking horror is not a problem, not much of a problem at least, you might shy away from using Shrivelling (enter Azure Flame or Wither) or you might teck in Horror healing via Fearless to balance things out.
If you mix the clue spell assets in one deck to have 4 or 5 cluegetter spells your ability to clue will rival a , this sort of dependability is something that the faction hasnt had insofar. The future is bright for the class.