Needful to Know is one of the few secrecy cards that could plausibly be used out of secrecy. Free scrying and threat reduction (to stay in secrecy longer) is very good, but even outside of secrecy; if you're running other scrying effects, this could be used to great effect coughgladdenmarshlandscough. Just off the pop, two resources for a quick scry and a bit of threat still isn't bad.
Needful to Know
Event. Cost: 2.
Action: Raise your threat by 1 to look at the top card of the encounter deck. Then, reduce your threat by X, where X is the threat of that card.
The Redhorn Gate #9. Lore.
It could be very useful in combination with Henamarth Riversong for threat reduction. — Mad Morderan 59