Rules FAQ:
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Attached character cannot be declared as an attacker/defender against the Pact's controller, and cannot enter challenges using card effects (e.g. Wardens of the North, Winterfell Kennel Master, Summer).
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Note that the Forced Interrupt triggers before attached character actually leaves play. So if multiple characters leave play simultaneously (Valar Morghulis, Wildfire Assault, Marched to the Wall), you can sacrifice a character that would be killed or discarded anyway.
- If Crown Regent redirects a challenge in which attached character is participating to the Marriage Pact's controller, attached character gets immediately removed from the challenge.