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how much stuff lets you break the legend rule that specifying nonlegendary is important here?
Here's what I could find:
Excluding "The Brothers Yamazaki" for how conditional it is, there are are 5 commander legal permanents that turn off the legend rule for (varying) permanents, creatures, or tokens you control.
Plus "Mirror Gallery" which turns off the legend rule for everyone, for a total of 6 cards in that space.
https://scryfall.com/search?q=o%3A%22legend+rule%22+legal%3Acommander&unique=cards&as=grid&order=name