Had a couple more random ideas:
CAPTURED SCOUT
House: Neutral
Type: Character
Cost: 3 Gold
Strength: 2
Icons: Military, Intrigue
Traits: Ally.
Keywords: Stealth.
Limited Response: during a MILITARY challenge in which you are the attacking player, discard Captured Scout from play (cannot be saved) to cancel the current MILITARY challenge and initiate a second one.
(Note: I purposely left out the "kneel and" before discard)
(U) MARGAERY TYRELL
House: Baratheon
Type: Character
Cost: 3 Gold
Strength: 2
Icons: Intrigue, Power
Traits: Lady. Queen. House Tyrell.
While Margaery Tyrell is participating in a challenge, treat all other Lord and Lady characters in play as though their text boxes were blank, except for Traits and Keywords.
THE IRON PRICE
Type: Event
House Greyjoy only.
Response: after you win a challenge, kneel a GREYJOY character you control with a MILITARY icon to draw X number of cards. X is equal to the knelt character's strength (to a maximum of 3 cards).
(U) THE TWINS
Type: Location
Cost: 2
House: Neutral
Traits: Stronghold. House Frey.
Opponents must kneel any number of Lord or Lady characters they control with strength equal to X in order to initiate a MILITARY challenge against you, unless they control a character with the House Frey trait. X is equal to the amount of characters attacking.
Just throwing them out there!
P.S.: (U) stands for "Unique" in case that wasn't obvious.