For 256 cards, plan on 15 double-sided 9-pocket pages
(Given that First Family is both green and blue, X is probably at least 2.) Flame On
PS Platinum Secret Rare QCSE Quarter Century Secret Rare Blackwing - Vayu the Emblem of Honor X DARK Level 1 [ Winged BeastTunerEffect ] ATK 800 DEF 0 This face-up card on the field cannot be used as a Synchro Material
This is a fun budget deck, and its also easy to build on MTG Arena since it relies mainly on common and uncommon cards
You can see an overview here: 90% (4th card), 60% (5th card) 5% (4th card), 20% (5th card) 1.666% (4th card), 6.664% (5th card) 2.572% (4th card), 10.288% (5th card) 0.5% (4th card), 2% (5th card) 0.222% (4th card), 0.888% (5th card) 0.04% (4th card), 0.16% (5th card) So, if you open 1,000 boosters, there should be one to two cards of the crown rarity
Of course this is different if you can sell several cards in the same order, but even selling a $2 playset isn't that appealing with $0.50 off the top