Firstly, it's a rare card on the MTG Reserved List, which means there are limited copies, and Wizards of the Coast will never print any more
What really makes the Radiant Blastoise card great, though, is the artwork by Masakazu Fukuda which perfectly captures the classic retro design of the Gen 1 Starter from the earlier games
This set brought back a leader parallel art format called "crew art" and it's not one of my personal favorites, but I must say that the Parallel Art for Boa Hancock, Foxy, and Jewelry Bonney do speak to me
While not likely to be the single most expensive card in the set, I would expect to see this card up there in discussions for most memorable from Azurite Sea
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Its one Move, Vine Whip, also has just enough damage output to take down many Pokemon that become threats down the line, such as Charmander, Staryu, and Froakie, in only one hit