If you're wondering what size binder you will need for a Twilight Masquerade Master Set with no cards stacked on top of eachother, we recommend a 12-pocket binder with 480 pockets.  

Here's the set breakdown:

• 167 Numbered Base Cards

• 147 Reverse Holo Base Cards

• 59 Secret Rare Cards
   

Optional Extras:

• 14 Variant Cards

• 8 Stamped Cards

• 6 Scarlet & Violet Promo Cards

• 8 Basic Energy cards

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In total, a complete Twilight Masquerade Master Set contains 376 unique Pokémon cards.