The player asked to have the deck reshuffled to ensure fairness.

reshuffled 是动词 reshuffle 的过去分词形式。reshuffle 由前缀 re-（表示"重新"）和动词 shuffle（洗牌、混合）组成，字面意思是"重新洗牌"。在句中表示"被重新洗过"的动作。