If you control a Spellcaster monster: You can banish up to 3 "Spellbook" Spells from your GY; apply this effect, depending on the number of Spells banished for this card's activation. You can only activate 1 "Spellbook of Fate" per turn. ● 1: Return 1 Set Spell/Trap on the field to the hand. ● 2: Change 1 monster on the field to face-down Defense Position or face-up Attack Position. ● 3: Banish 1 card your opponent controls.