I think I see what you mean now. If you roll 20 dice and select the highest, the next time you throw that very same die it’ll probably have a lower value, simp

I think I see what you mean now. If you roll 20 dice and select the highest, the next time you throw that very same die it’ll probably have a lower value, simply as a consequence of outcome-dependent selection + a fixed probability. It’s not that the probability has changed, just that you didn’t choose the first outcome according to the true generating distribution. Comparing this highest value with the highest value across all coins when you toss them all again a second time is a different matter. It’s no more likely to be lower than higher. It's best to avoid using the term “luck” altogether in discussions of probability, since it’s easy to misinterpret.