True, there is no Walking Ballista shenanigans to be able to cast it on turn one, but even casting it for one mana later in the game to allow you to cast two spells in one turn is strong
Combine it with cards like Arcane Adaptation (which changes the type of every creature you control to another of your choosing), and you can easily start locking players out of the game
I love how the mechanic leverages Magics history and has this neat little narrative/mechanical cohesion within each spellbook, but the implementation feels insufficiently random, awkwardly presented, and not always immediately obvious what the narrative/mechanical cohesion is
Remember, youre a Magic player
After that, regardless of whether or not you chose to attach the Equipment to a Samurai you control, the job select ability will create a Hero token and attach the Equipment to the Hero token