Imagine all the garbage bins there are in Kamigawa! Soothly, there is happiness in the multiverse!
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I guess no, no they don't become a relevant humanoid from the plane - just get larger?
We don't really have enough perspective cues to conclusively tell if their sizes change. This looks like a direct portal from one plane to another, so I'd assume there's no size change going on. Dude is going to have extreme culture shock seeing a rat three times their height.
I would prefer that, but judging by the trees, the racoon is about human size... So I guess world building and flavour cLled it a day and dialled in: "it's Magic: the Gathering I don't gotta explain shit" ?