I love this card for many reasons. First, its role in the story and the poem it represents. Second, its ability to take out those pesky Nazgul permanents. Third, its ability to cancel one Nazgul attack. And finally, because I often play with (or others provide me with) Doors of Night, my characters gain +1 prowess until the end of turn. I can even play more than one per turn, if needed and available.
My second point above is this card's strength, as many players use Nazgul for various reasons in their permanent-event. This card stops them cold. ZAP! No more nazgul; they don't even get to fire off their special ability as a parting shot. The versatility of this card is considerable, from disabling a Nazgul machine, to negating Out of the Black Sky and In Great Wrath, to negating or at least delaying some of the recycling of The Nazgul Are Abroad, to taking care of Adunaphel and Ren tapping key characters and forcing corruption checks.
The ability to cancel a Nazgul attack without a corresponding corruption check is vital life insurance for almost all characters and allies. I believe you can even use this if you are visiting the Under-leas or the Iron-deeps.
The bonus to prowess is handy, as it comes as a surprise. Of course it requries Doors of Night to be in play, or Peril Returned, but this is rather easy as at least one player is likely to have a hazard strategy based on Doors of Night. This bonus to prowess works even during company versus company combat, as the bonus is to the character.
The nice thing about this card is that you cannot go wrong. It offers a free +1 to all your characters until end of turn if DoN is in play. It offers the ability to cancel Nazguls, upto the number of characters you have in play. N.B., You must specify which characters are going to tap to take out nazgul at the time of declaration.
Ok, so all decks can benefit from this card. So, how many do you put in your deck? If you are playing with a Doors of Night/Peril Returned hazard strategy, you ought to include 3 of Praise to Elbereth. If you are planning on traveling to or through prime nazgul territory, you should have at least one if not more in your deck, and the rest (if any) in your sideboard. If you are stealthily dribbling up to Orodruin to do a 360 whirly dunk (with Smeagol to rebound for the point), you don't want Ren or Adunaphel or some of the others from mucking up your plans.
What hero decks would not benefit by this card? Hmmm. Even the sisterhood (nazgul huntresses) may want the panic safety option, plus the prowess bonus is always welcome. I suppose the only reason not to have this card in your deck is that you have only a fixed number of slots and they are already filled with strategy essential cards. I recommend that you take another look at your mission critical cards; are they as playable as Praise to Elbereth? Are they as vital to the success of your objectives as you originally thought?
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)