Can a player use cards not released in the same set during a standard tournament?

In a Standard tournament, players are required to use cards that are legal in the Standard format, which is defined by the most recent sets released and any previous sets that are still within the Standard rotation. The card pool for Standard is limited to cards from the current and most recent blocks or core sets. Since the format is designed to provide a fresh and dynamic environment for players, using cards from sets that are not currently legal in Standard is not permissible. Therefore, players must adhere strictly to the legal card pool as defined by the current rules, which is why the answer stating that players may only use cards that are legal in the Standard format is correct.