While the Ancient Covenant makes Bless tokens better but doesn't preserve them, this significantly improves Curse tokens (effectively a +3 to the skill test) but puts the token back into the bag where it can be drawn again (if immediately, blasphemies may occur, which seems only appropriate).
Is this a good card? Maybe? If the bag has a lot of Curse tokens in it, this only briefly and weakly addresses the problem. With only a few, it probably hedges a roll. We willll have to see the entire Curse token tech suite to know for sure.