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Question about displaying cards like Wall of Fire or Aqueous Orb. When must they be displayed? Do they need to be displayed before an encounter to be able to activate the “for your combat check” ability? Or can you display it and activate that ability in response to encountering a monster with a combat check to defeat? I am playing S&S currently.

With the Blackwing Librarian, can it be used to automatically succeed at a check to recharge a spell? Not clear on what a "check against a boon" refers to.