This trap is easily my favorite. It's best in a solo game as there is usually only one enemy added a round except on some of the more combat heavy scenarios. And obviously should only be played with Damrod the king of traps for the cost reduction and card draw bonus. But if you go that route this card is incredible.
For 1 resource you essentially have Lore's version of Hands Upon the Bow but you can use as many characters as you want. Being able to to crush an enemy before they launch their attack is awesome as you don't have to use a defender or play the shadow effect game.
If you add in ally Anborn you can do this every single round and be able to launch your first strike attack forever.
This card is balanced by the fact that you pretty much want to play it only in the above combo. And that there are plenty of big bad enemies that are immune to player card effects and attachments. So you will want to pack some other options for those quests.
But for the majority of quests this is a great option.