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This could hamper your opponent's ability to cast strong combos and remove some of their most useful creatures from the mix

Because Big Mom Pirates remains a competitively viable theme for decks all the way through to the OP-10 metagame and beyond (if Eastern testing is to be believed), many of these stronger characters have stayed powerful and expensive

While in recent years Shiny Pokmon have become a bit more common (especially in Shining Fates), at the time they were a massive deal, which is why Rayquaza Star is worth almost $1000

Getting the Treasures is a fine bonus and will eventually repay you nearly everything you invested into the spell