I know i tagged general but there is some one sided tomoyo/sakura if you squint
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Duel monsters is the cool, popular card game that everyone plays, Sakura herself included. She isn't very good at it, but she doesn't need to be good to have friendly matches against her brother or Tomoyo.
Then the whole Clow cards thing happens, and suddenly duel monsters is a little more than a simple card game.
Or, an AU where everything is the same but duel monsters is a thing and Sakura figured out they have a little magic she can use.