Good card.
Spending actions to heal horror is already a thing people play, albeit usually with techniques that heal 2 horror in one go, as with Logical Reasoning and Clarity of Mind.
That said, healing 1 horror and pouring into the bag is just very, very good. But tokens may not be quite as good as healing a second horror, and the book is a hand slot item. Which means that if you aren't targeting mechanic, or if you need that hand for something (usually a weapon), then it's not super great.
For builds, especially in a team setup, it's outright excellent! A fighting character with an empty hand can wait for enemies to show up, and instead of wasting the turn taking resources or cards, they can heal people, and while they're doing that they're making tests easier and creating a window for combo's to activate in. Because you often find yourself using this thing twice or thrice in a turn you actually blow up the Chaos bag quite a bit with , perfectly setting up for the next turns where you hopefully draw into these tokens.
Outside bless: Only ever really look at this card if your hands arent full, and even then, only if you're worried about horror.
In bless: Yes, near autotake in big teams using .