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Spellbook of Judgment X SPELL Quick-Play During the End Phase of the turn this card was activated, add "Spellbook" Spells from your Deck to your hand, except "Spellbook of Judgment", up to the number of Spell Cards activated after this card's resolution, then, you can Special Summon from your Deck 1 Spellcaster monster whose Level is less than or equal to the number of cards added to your hand by this effect

And with each new set, theres a series of chase cards that value from $50 to $100 to $500+

No matter what, this means retailers will often increase their prices to match the competition too

Of course Im looking at prices in Japan

Japan Auctions, making it the most streamlined proxy for Japanese C2C marketplaces