You can only activate 1 "Goethe Spellbook" per turn. If you control a face-up Spellcaster-Type monster: Banish up to 3 "Spellbook" Spell Cards from your Graveyard; apply 1 of these effects depending on the number of cards that was banished for this card's activation.

1: Target 1 Set Spell/Trap Card on the field; return it to the hand.

2: Target 1 monster on the field; change it to face-up Attack Position or face-down Defense Position.

3: Target 1 card your opponent controls; banish it.