The traits are wrong for this card. It is currently "The Seven"; should be "House Bolton" and "Maester".
House Stark. Non-Loyal.
Character. Cost: 4. STR: 3.
House Bolton. Maester.
Reaction: After you initiate a or challenge, sacrifice Dreadfort Maester to raise the claim value on your revealed plot card by 1 until the end of the challenge.
The Archmaester's Key #2.