Do I understand correctly that you can use the Action: part of this card to cheat this into play without paying its resource cost (and discarding two cards, ideally Elven-lights) in such quests as Escape from Dol Guldur where there's a limit of "one ally played per round for the whole group" similarly as you can cheat allies into play with Sneak Attack or with Elf-stone in the same way?
Yep spot on. You are putting the ally into play, not playing it. So you get around the play 1 ally per round limit. Note also you can use this action any action windows you like. Doesn't have to be in planning if you don't want to do it then.
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Marctimmins89
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