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Either Win Shares incorporated, or totally independent leagues + the ability to make playoffs between said leagues that stick. I'm thinking of the Little World Series (or whatever it was called) between the PCL and AA (or INTL League) that went on during the 20th Century. They had nothing to do with one another, but the league champions would face one another. This would be a major boon to historical-fictional leagues.
I had others, but I can't remember them. These are the ones that really stick out, though.
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