Even with 30 cards this deck is still fairly consistent thanks to its amazing search power combined with That Grass Looks Greener and other cards to mill your deck. The power of this deck comes from having a lot of Spellbooks in your graveyard, banishing them for costs, and then retrieving them for reuse. Restart and try to get That Grass Looks Greener in your starting hand.
A good way to start your plays is to mill your deck as much as possible. This is because your main removal card Spellbook of Fate and your biggest beater Prophecy Destoyer, both requires Spellbooks in the Graveyard to fuel their effects. Spellbook of the Master also requires Spellbooks in the graveyard to copy their effects.
That Grass Looks Greener is an excellent card to draw early in the game because it alone could allow you to mill up to 9 cards depending on your opponent's deck size, so using Restart to try and open with it is not a bad idea. Keep in mind That Grass Looks Greener is useless in a mirror match or when dueling another 30 card deck, therefore it is best to Restart and open another card.
Lyla, Lightsworn Sorceress mills your deck by 3 cards during every one of your end phases. She also makes a decent beater on the field, and when needed you can activate her effect to destroy your opponent's spell/trap card while changing her to defense position. But keep in mind, when in defense position, she will most likely be destroyed immediately during your opponent's turn because of her weak defense stat.
Spellbook Magician of Prophecy allows you to search a Spellbook spell card from your deck when he is normal summoned. In most situations the best card to search is Spellbook of Secrets, which in turn could search out any other Spellbook card including Spellbook Magician of Prophecy. After normal summoning Spellbook Magician of Prophecy, you are now left with a 500 attack monster on the field which can't really do much. Use Monster Gate on your face-up Spellbook Magician of Prophecy to mill your deck and special summon a possibly stronger monster.
Special summon The Tricky as a beater while also utilizing his summoning cost to your advantage. Discard Prophecy Destroyer to the graveyard where he can revive himself. Discard a Spellbook to load your graveyard for your other card effects, you would usually want to discard an unusable Spellbook Library of the Crescent or a Spellbook you have already activated for that turn.
Both of these monsters require you to have 5 or more Spellbooks in the graveyard to bring out their full power.
Fool of Prophecy can send a Spellbook from your deck to graveyard once per turn. Send to the graveyard a Spellbook that you want to copy with Spellbook of the Master, or you can send a Spellbook Library of the Crescent to the graveyard mid-late game when it would be a dead draw. When sending Spellbooks to the graveyard keep it mind it would be best to have many differently named Spellbooks to trigger Fool's effect during the End Phase.
Reaper of Prophecy can be special summoned with Fool's end phase effect. And it is always best to summon him when you have 5 or more differently named Spellbooks in the graveyard, searching a Spellbook from your deck and Special summoning a level 5 or higher Spellcaster-type monster. It is best to special summon something other than another Reaper of Prophecy because you can only only active the effect of 1 Reaper of Prophecy per turn. Reaper of Prophecy's effect also activates when he is special summoned, like with Spellbook of Life.
Spellbook of Secrets can search out any Spellbook card including Spellbook Magician of Prophecy but excluding another copy of itself. You could use this to add Spellbooks to your graveyard and then use Spellbook of the Master to search another Spellbook from the deck.
Use Spellbook of Power to boost a Spellcaster-type monster's attack by 1000 and then searching a Spellbook spell card from your deck when the targeted monster destroys a monster by battle. You can use Spellbook of the master to double up on this effect and boost a total of 2000 attack and searching 2 cards.
Prophecy Destroyer is the strongest monster in this deck via stats. Most of the time you do not want to get him in your hand, he is best used when he is milled directly from the deck to the graveyard or special summoned via Monster Gate. In the graveyard, he can revive himself by banishing 3 Spellbook spell cards in your graveyard. Or you could revive him with Spellbook of Life if you have another Spellcaster-type monster in the graveyard and a Spellbook spell card in hand. The best monster to banish would be a Spellbook Magician of Prophecy in the graveyard. Another monster you might want to revive with Spellbook of Life is Lyla, Lightsworn Sorceress in case you want to get rid of a spell/trap card on your opponent's field.
Spellbook of Fate has varying effects depending on the number of Spellbook card you remove from play as cost.
The first effect is useful for protecting yourself against opponent's backrow. Use it before the battle phase to return cards like Wall of Disruption to the hand without your opponent getting a chance to activate it. This effect can also help you disrupt Sea Stealth Attack boards.
The second effect can be used to defend against attacks and change your opponent to a vulnerable position similar to Enemy Controller's first effect. Additionally it can disrupt effects that activate upon summoning like Cyber Angel Dakini and some Sylvan monsters by flipping them face-down.
The third effect is just a way to get rid of anything from the field by banishing it, and keep in mind this does not target nor does it destroy meaning it is effective even against monsters with those forms of protection.
Spellbook of Eternity is a surprisingly versatile card with the high amount of banishing this deck is able to perform. Use Spellbook of Eternity to retrieve any banished Spellbook you need for the situation. Because of this you should always prioritize banishing your most versatile spell, Spellbook of Fate, to be reused as Spellbook of the Master cannot copy it's effects.
Spellbook of the Master is a good card to use in any Spellbook deck, because it can use the effect of any Spellbook normal spell in your graveyard. This bypasses the the Spellbook's activation condition. Also since all Spellbook cards have a hard once per turn effect, Spellbook of the Master allows you to practically activate it's effect twice in one turn. Usually, the effects you want to copy are Spellbook of Secrets or Spellbook of Eternity to cycle other Spellbooks into your hand.
Unfortunately grass spellbook is prone to bricking a lot without grass