
I think that the 4 resource cost is going to be prohibitive for most investigators. For 4 resources, you can play an asset that will help you actively advance the scenario such as Dr. Milan Christopher or Beat Cop. In my opinion, this card doesn't really deliver a powerful enough benefit to justify that cost.
Still, Carolyn Fern might want it for its flexibility and its potency. Any Mystics who are running 2 Arcane Research assets can benefit from its stronger horror healing ability early on, and Agnes Baker in particular would appreciate that. If the campaign has gone poorly, I can see some Rogue characters using their Adaptable talents to switch this card in towards the end of the game.
I think you'd only ever use it for the heal on traumatized investigators - if you use it for the one-off healing, it's mostly less effective than First Aid, and that's saying something, since First Aid is largely regarded to be an inefficient card.