4 pocket trading card binder Zettokete Ringless Binder, Holds 160 Cards The Green Vault X 4 GameStop 4-Pocket Card Binder with

It seems like rarity is the main force behind the price spike

One of the biggest factors affecting the cost is the rarity of the cards you want to include

It allows the heroic player to loot through their deck, adding this aspect of hand-management and speed that the deck didnt have previously

Xyz Materials attached to it also become Xyz Materials on the Summoned monster.) When a Rank 5 or higher Xyz Monster(s) is Special Summoned to your side of the field while this card is in your Graveyard (except during the Damage Step): You can add this card from the Graveyard to your hand

Other variants also saw a similar spike in price