how do you know if a yugioh card is valuable

how do you know if a yugioh card is valuable 20 years ago I traded the first ever ultra rare Yu-gi-oh I owned & I regretted it to this day...so it does feel good to own couple of these again, even Guide to Yu-Gi-Oh! Card Rarity

Name: how do you know if a yugioh card is valuable 20 years ago I traded the first ever ultra rare Yu-gi-oh I owned & I regretted it to this day...so it does feel good to own couple of these again, even Guide to Yu-Gi-Oh! Card Rarity
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How Does Brawl Work and How Is It Different from Commander

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