Rules FAQ
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If the attacking player cannot discard a card, the challenge will end immediately.
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If Lannisport is targeted by assault, it will already be blank by the time you could trigger its reaction.
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When the Crown Regent title is used to redirect a challenge in a Melee game, that challenge is still considered to have been initiated against the original opponent. If the original opponent controls Lannisport, they can trigger it to try to end the challenge even though they are no longer the defending player. If the new opponent controls Lannisport, they cannot trigger it in that challenge.
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If a or challenge is changed to with Storm's End (BtB), a is not considered to have been initiated. You cannot trigger Lannisport in that scenario.