I think it's mainly the +2 and the -1 that make Sorin powerful
The kingdom of Alexandria, ruled by Queen Brahne, begins their invasion of other nations under orders of Kuja, the "angel of death" from Terra

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Incidentally, due to the wording, this ended up making "Sand" into a creature type in subsequent expansions
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The stories filled him with such awe for the great dragon that he decided to dedicate his life to Ryusei, never mind that Ryusei had been reincarnated hundreds of years ago