First, it depends on what rarity it is.
There are kinds of rarity:
-Common
-Rare
-Super Rare
-Ultra Rare
-Secret Rare
-Ultimate Rare
-Ghost Rare
-Star Foil (In Star Packs)
(Not all cards have all the rarities.)
Then, it depends on the card itself. Certain cards in the Yu-Gi-Oh! Meta are priced based on how it is doing in the meta game or how rare like Tyler the Great Warrior, only one exists. That also includes tournament prize cards.
Check on Ebay or any similar sites to check the average prices of the cards.
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Since you can't get it anymore unless your an old Shonen Jump member, I'd say it's worth about 50 Canadian bucks.
it is not very rare, but I heard it is sold for 2 bucks
Around 18-25 US cents.
blue eyes white dragon is worth $4.50- $6.00 depending on which version.
A Spanish 1st edition Machamp Pokemon card is worth around $20.