It used to be that if you wanted to marshal a faction to your side and wanted to get around Snowstorms, Sieges, or avoid hazard creatures, your only choice was Old Road. Hour of Need provides a limited scope addition to this strategem.
"Playable on an untapped non-warrior, non-Wizard diplomat during the organization phase if you have a faction in your hand." This excludes Aragorn, Imrahil, Denethor, Elrond, Cirdan, all other elves with a prowess greater than three, all dwarves, Theoden, etc. Zap. Do not pass GO, do not collect a faction. Don't even think of attempting the Army of the Dead. OK, that is who cannot use this card.
Who can use this card? Galadriel is the biggest player, followed by Galdor, Peath, Frodo, Galva, Adrazar, Arinmin, down to the dough-boy, Halbarad. Six is the maximum amount of DI to start (Galadriel and her ring). Boost with Lordly Presence (+5), Tempering Friendship (+4) or New Friendship (+3) or even A Friend or Three. If you want two tries at it, use Persuasive Words on the faction. Of course, a Horn of Anor (+2) can help, and the Red Arrow is thematically correct, though applicable only to the Riders of Rohan. One option often neglected is having a non diplomat wear a Magic Ring of Words. Presto! A do-it-yourself diplomat, who courtesy of his (or her) mail-catalog diploma qualifies to play this card. Of course, you could use MRoW to boost your diplomat (+3). And because we are talking about rings, a Lesser Ring or three gives you +2 per ring. Just imagine, Galadriel decides to wear three lesser rings; she is virtually a walking wizard at 10 DI for only three (3) corruption points. Just keep her ladyship well protected, from both overly forward suitors (e.g., "Bert, stop yer' droolin!") and from the temptation to run to the nearest shopping mall to search for earrings to match (failed corruption, if you want it in plain English.)
"Count out the number of contiguous regions from the diplomat's site to the site where the faction is normally playable (including the regions containing both sites)-subtract two plus this number from the diplomat's attempt." If Galadriel is visiting Edoras but plans on going home this turn, have her lay out the case of why the Rohirrim should get involved with her wizard. Because she is at Edoras, the number of contiguous regions equals zero. Therefore, attempt (A) minus (2+0) equals the result. I would only consider Galadriel for this card if and only if I could guaranty success. There is that booby prize to consider: discard the faction and the diplomat if the influence attempt fails!
Adrazar is another option, with less riding on a failed corruption check. He is both a scout and a diplomat, so can be usefull even tapped (Hiding.) His prowess is ok, but his body needs boosting if ever he runs into combat. Arinmir is an equally viable alternative, offering sage abilities in addition to diplomatic skills. Both only risk 1 MP, Adrazar offering 1 DI and Arinmir offering 2 (+2 for influencing the Variags, a net effect for this card of zero). Galdor costs one more point of influence to control than does Arinmir, but offers a nine (9) body and a more versatile DI bonus; however, you risk one more point of MPs.
Lastly, Roac the Raven can use this card. Squawk! Note, this card is not restricted to characters. Squawk! You are risking a 1 MP ally, rather than a character. Squawk!
In short, this card squeezes more MPs out of a given turn, always a good thing if successful. To play this card well requires that you have either DI boosting cards for your diplomat, or DI boosting items, or a mixture of the two.
Original card review taken from : http://fan.theonering.net/morgulrats/
With the authorization of the webmaster.
The reviewing team consisted of Gwaihir (Chris Farrell), Gimli (Nathan Bruinooge), Ohtar (Charles E. Bouldin, Esq.), Radagast (James Kight), Joshua B. Grace (Beorn), Martijn Steultjens (Fram Frumgarson), Jason Klank (Saruman) and Jeffery Dobberpuhl (Wormtongue)