Seal (up to 5 [bless]). If Rite of Sanctification has no tokens sealed on it, discard it.
When an investigator at your location plays a card, exhaust Rite of Sanctification and release a chaos token sealed on it: Reduce the cost of that card by 2.
Guardian economy in an uncontested slot? Because let's be real: nine out of ten times the investigator who needs the most help offering for their assets will be the guardian. In a Sister Mary deck this feels like an auto-include, since it only needs two tokens sealed to beat Emergency Cache, with the potential to far outstrip that in terms of resources generated. It remains to be seen if someone like Roland or Yorick will be provided enough tools to stuff the chaos bag with bless tokens and make this reliable.
It also remains to be seen if someone like Carolyn or... Skids, I guess? could make use of it as a support tool for the other members of the team. I can't really think of anyone else who could take it (besides Dunwich, and it's probably too niche unless they're going full bless) and not really need the economy; Diana can take it but she wants her arcane slots, and there isn't a seeker/guardian that I know of, or a minor guardian other than those above. Correct me if I'm wrong.
So the power here depends on whether I can load the bag with bless tokens while fighting, moving, and protecting my allies; if I can (or if I'm Mary) it's arguably better than emergency cache. If I can't, it's probably a miss.
Final note, it can't go under SttP, but that's a pretty minor hit. Excited to see it in action.