I will only point out what is important from the characters text boxes:
Lyanna Stark: Non-unique characters get -1 STR while knelt.
Killer of the Wounded: Response: After a character's STR is reduced by a card effect, stand Killer of the Wounded.
Brass Link: Any Phase: Kneel attached character to discard the top X cards from any player's deck. X is the number of Chain attachments on attached character. (Limit once per phase).
Now you probably see the big picture here. I will tell you this: In 1 round, i managed to lose 50 cards due to Brass Link.
Limit Killer of the Wounded's Response or something ,because this is a deck killer.