I don't believe security trimming at the card level is possible. So you can't filter cards for them.
What you could do is simply have another private board and link the cards that you care about or if it's not so much a security risk as having the person focus on their cards, they can quickly filter to their cards by pressing 'Q'.
The days are flying by so fast, I can’t seem to slow things down no matter how hard I try. My memory is great; however, I can’t seem to remember vivid details or even highlights from each year of my ...
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