|  |  | ciid is short for card instance id. It's the id of every copy or instance of a card in a single match. It's not to be confused with nid which stands for node id, which is the id of a card in the database. Multiple copies of a card share the same nid. | 
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|  |  | nid can be saved and used between multiple matches but ciid cannot. ciid is meaningless except in the current match and may refer to different cards between matches. | 
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