This isnt so important, but some people like to memorize it before they open booster packs, so that they know which card will be the rare one, and can look at it last to add an element of suspense
Adding Spellbook Spell Cards to the hand at the End Phase (up to the number of Spells activated after Spellbook of Judgment is resolved) is nice, especially in tandem with the Special Summon of a Spellcaster from the deck (of a level equal to the number of Spells)
If you exile a historic spell, you can cast it thanks to Rona, Disciple of Gix
Rid is a silent collector suddenly has a binder full of cards but blames me for his addiction, Zam has interesting outlooks on deck making and play, the most shocking one we converted Fiq2 into a fan after queueing with us for Prismatic Evolution
PS Platinum Secret Rare QCSE Quarter Century Secret Rare Evilswarm Ophion X DARK Rank 4 [ DragonXyzEffect ] ATK 2550 DEF 1650 2 Level 4 "lswarm" monsters While this card has Xyz Material, Level 5 or higher monsters cannot be Special Summoned
Plus, the intel that it provides when peeking at your opponents hand makes it already worth so much more
