To put together your dream team, you must first play in season mode. Then, go to the trade screen with the team(s) you want the players from. Select the players from the other team only using the X button, Max 3 players at a time. Then hit the O button. You will be asked to release the players or sign them onto your team. Of course you want to sign them. After that, you will receive the 3 players without losing any of your players!! You will notice an overload on your roster, so, just reverse the process this time to the other team, or put them in your farm system, getting rid of the players on your team you don't want. Do this with as many teams/players as you want until you have an all-star roster!!
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