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Technically this is possible with the PowerUp Unito, however, this is a paid PowerUp.
Alternatively, have a look at my answer on Butler rule for adding card to a board if your assigned tasks where I detail how this can be achieved with linked checklist items.
The problem with having synced cards is that if you're not the only person on them, but you're the only person on the second board, anything that someone else does on the first board won't show up on your second board, which creates a problem.
However, if you want to see specific cards, that you're assigned to, on one of your own boards, then using linked checklist items is a better way to ensure that what you're looking at is always up to date without creating unnecessary duplicates that can go wrong.
Please come back to us with anything further! That's what we're here for!
You might be able to with Card Mirror by Unito, but I'll be honest, I've never used it! If you type into the PowerUps things like mirror and sync and words like that, it'll give you all the options that have those kind of words in the title, but again, some of these are paid for PowerUps.
You could also Google something like 'card sync for Trello' and see if anyone has written a blog post or something like that, where they've implemented something similar.
Hello Community! My name is Brittany Joiner and I am a Trello enthusiast and Atlassian Community Leader. I'll be sharing with you a series of videos with my top tips on how to best use Trello...
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