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A secondary minor league for players signed and without spots in AAA minor league. You can always put a limit on how many can be sent there.
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Prospects from the NCAA. You have those in your basketball and football games.
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The ability to have players waiver their no trade or no movement clauses.
and one more….you have when skaters reach milestones during the game. You need to have those for goalies too. It can me mentioned after the game.