Spellbook of Judgment might be one of the most cracked cards ever printed, basically reading that you can add as many spellbook spell cards to your hand as you want along with allowing you to special summon the card with a level equal to the number of spell cards that you activated that turn
Unlike the girl, the opponent can easily target it and put it away, and since it has no effect at all when it becomes the target of an attack, it cannot be used to pressure the opponent like the girl
They came back to show grandma the discovery, and she informed them that they hadn't found the true stash yet
I also highly recommend getting a binder that has side-loading sleeves rather than top-loading sleeves, because your cards wont fall out of your binder
Special Summon 1 Level 4 or lower Psychic monster from your hand or banishment
It has the possibility to go infinite if you can hit the 25% jackpot on each roll