I didn't reread all 200 pages of this, but I haven't seen any Game of Thrones cards yet, so here are my ideas. No Spoilers of S7, but read at your own risk if u just started the Seasons 1-6
The Iron Throne
Action
$2
--------------------
Gain 7 Provinces, a King's Court and an Advisor.
---------------------
This can only be gained if there are at least 100 cards in the trash.
Winter Is Coming
Event
$3
+2 cards
All players put their -1 card token on thir deck.
----------------------------------
All your Sauna cards become Avanto cards.
Night King
Action - Attack
$5
-------------------------------
Trash a Knight from the Knights pile
Every other player reveals the top card of his deck. You may trash it. Gain any of the trashed cards this turn.
--------------------------------
When this is used in a game, also use the Kights pile
This card can only be trashed by "Dragon Glass" or "Valyrian Steel".
Tywin Lannister
Action - Attack
$4
--------------
Remove all your debt tokens
All players have to discard their Throne Rooms and Kings Courts.
Iron Bank of Bravos
Treasure
$6
----------------
+$2
Each player counts his VP, If you have the most: This produces extra $2.
Jon Snow
Action
$3
-------------------
+1 card
+1 action
If you play Jon Snow the second time this turn, gain a Mercenary
-------------------
Setup: After 5 turns this supply pile goes to the trash and may only be regained by cards of the "Lord of the Light" pile
Trial by Combat
Event
$4D
-------------------------------
Choose a card you have in play. Every other player have to reveal a card from their hand. If their card is cheaper they trash or discard it, you choose.
Jaqen H'ghar
Action
2$P
-------------------------------
Choose a card from a supply pile. If no copy of it is already in play: This become this card until it leaves play.
Ser Bronn from Blackwater
Action- Duration
$4
--------------------------
Gain a Coin Token.
You may discard two cards from your hand. If u do: Set this aside. 2 turns later, you may get a castle from the castle pile and discard this.