Its an aggravating system that has lots of players confused and angry its meant to severely limit how much you can trade cards, so trading is only viable in a very limited way
Japanese cards tend to grade higher thanks to better printing standards, more precise cutting, and higher-quality materials, making them more likely to achieve that coveted PSA 10 grade
Some have more generic fusion requirements, an abundance of spells and effects to summon them, or skip the requirement of a fusion spell or effect to make them (which is sometimes called contact fusion)
It's a fun way to maximize powerful exhaust cards
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