"Hold all the cards," "have everything under control," and "be in the driver's seat" are all common synonyms for the phrase "hold/have all the aces." All of these idioms convey the same meaning: being in a position of power and advantage over others. This phrase is often used in competitive or strategic situations, such as in business, sports, or games of chance. It also implies that the person or group in this position has the ability to dictate the outcome of the situation. Using these synonyms adds variety to your vocabulary and can help you better convey your ideas in different contexts.