Writer, artist, voice actor, cosplayer, huge friggin' nerd from the magical land known only in myths as Finland. And as a Finn, I require coffee: https://ko-fi.com/N4N715XLW:
Spellbook of Sword Normal Spell Target one Spellcaster-type monster you control: This turn it can attack X the number of Spellcaster-type monsters you control. Other monsters you control can't attack the turn you activate this card. You can only activate 1 ‘Spellbook of Sword’ per turn.