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However, looking at the "Select Expansion" screen, it appears as though there's space for six different expansions, suggesting that this could be the maximum amount that will be available at any given time

The reverse holo master set scope is debated

Based on Japanese community opening data: 23 SR cards per box (guaranteed), roughly 1 SEC per box, 1 Leader Parallel per 6 boxes, 1 SP per 12 boxes (1 per case), and 1 Manga Rare per 72+ boxes (1 per 6 cases)

Shiny Charizard V is an obviously rare find

When supply is limited to one region, global demand naturally pushes prices higher

GEN 1 Best = Ghost-Normal and Ghost-Psychic (tied)