There's a weird bug with this card, I really can't understand it: you can't find it using the "cost" filter. try it yourself, set "cost" filter to "recruits only".
I've noticed it because the card wasn't discarded by "Sheath your swords", as in the last turns of this
game.
I wonder if there are other cards with the same bug.
Edit: ok, I got it: there is nothing written in the "brick cost" slot of this card, there should a "0" instead.