Effect
You can reveal 3 "Spellbook" Spells in your hand; Special Summon this card from your hand. Once per turn: You can banish 1 "Spellbook" Spell from your hand or GY, then target 1 card on the field; destroy that target.
The monster effect "①: You can reveal 3 'Spellbook' Spell Cards in your hand; Special Summon this card from your hand" is an Ignition Effect that activates in the hand. (This effect does not target. When activating this effect, you reveal 3 "Spellbook" Spell Cards in your hand as a cost.)
"High Priestess of Prophecy" is a Normal Summon monster. (Even if it has been sent to the Graveyard from the hand or Deck, you can Special Summon it with the effect of "Monster Reborn".)
The monster effect "②: Once per turn, you can banish 1 'Spellbook' Spell Card from your hand or GY, then target 1 card on the field; destroy it" is an Ignition Effect. (It is an effect that targets 1 card on your or your opponent's field.)
When activating the monster effect "destroy that card," you banish 1 "Spellbook" Spell Card from your hand or your GY as the cost.
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