When someone says that the cards are stacked in someone's favor, it means that someone has a significant advantage in a particular situation. Synonyms for this phrase include "the odds are in their favor," "they have the upper hand," "they have the advantage," and "they hold all the aces." These phrases convey a similar meaning as "the cards are stacked in someone's favor," but with their variations in nuances. They all mean that someone has an edge over others in a given setting, whether it be a game, a job interview, or a business deal. By using these synonyms, one can communicate the idea of advantage more effectively and diversely.