While the Troll-Purse in The Hobbit belonged in the company of Bert, Tom and William, the one in the card game cannot be played with the trolls in either their creature or their character modes. This version only effects automatic-attacks and can be used with orcs as well as trolls. I can't imagine how an orc would end up with a troll purse, but that is neither here nor there.
This card is the only 'capture' card relating specifically to automatic attacks. It can potentially take an entire company prisoner as "any successful strike" captures a character. In a worst case scenario, four hobbits enter Moria to play the Mithril Coat concealing the Orc automatic attack with Concealment. But Troll-Purse is on-guard. When the Mithril Coat is played, the hobbits now face a greatly increased orc attack. Tapped out, they can no longer conceal themselves and are all taken prisoner. Since the site was tapped, it goes to the discard pile and the player controlling the hobbits is stuck with all those negative marshalling points for prisoners while he waits for his deck to cycle to retreive Moria from the discard. Ouch!
A much more likely scenario is that one character may be taken prisoner and instead of moving away, the company remains at the site another turn to bail the poor fool out. Not bad turn ecomony, but their are easier ways to delay a company. Also, against hero companies, the opportunity to play Troll-Purse is limited. A hero deck can easily go the entire game without visiting a single orc/troll automatic attack site. Therefore, I didn't put Troll- Purse in my decks.
Then along came Lidless Eye. Minion companies do go to Orc/Troll sites. Heck, they practically live in them. And Troll-Purse doesn't care if the site's attack is detainment. A detainment attack will bag a character just as quick as a normal attack. It can still be tricky to play Troll-Purse. The company must play an item, but a minor item after a faction or ally is sufficent. Troll-Purse will have a more difficult time bagging high prowess overt minions, but is gives up no MPs should it fail.
The best use for Troll-Purse is in a deck will lots of auto-attack enhancers. You can turn a relatively light attack like Goblin Gates' into a nightmare from which companies will rarely return unscathed.
Overall, I find Troll-Purse in few of my decks. It's unreliable against heroes and may not be strong enough against minions. Still, it has a valid place in auto-attack hazard strategies and orc/troll theme decks.
One final note, Troll-Purse should always be played on-guard. When using on-guard cards, and sometime even when you aren't, you should play an on-guard card at every site on every turn that the hazard limit allows. That way, you won't telegraph your intentions when you have a real on-guard card.
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)