What can lead to unfair advantages during a match?

Listening to other players' matches can lead to unfair advantages during a match because it allows a player to gain insights into strategies, card choices, and possible plays that their opponents are using without engaging in the match themselves. This information can lead to a better understanding of how to counter their opponents' strategies or exploit weaknesses that they otherwise would not have known about, thereby creating an uneven playing field.

Having a well-constructed deck, practicing extensively, and being knowledgeable about current meta-strategies are all part of effective gameplay and strategy development and do not inherently create unfair advantages. These aspects are expected elements of preparation in competitive play and are encouraged to improve players' skills and understanding of the game.