Rules FAQ
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All the standard rules for ambush still apply. It only works with cards in your discard pile that have the ambush keyword, and it only works during the challenges phase. Any effects that modify the cost to ambush a card also apply (for instance, The Many-Faced God).
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If you ambush a card like Gold Cloaks or The Queen's Assassin from your discard pile, that card is still considered to have entered play “using ambush”.