[REQUIREMENT] When your opponent Normal or Special Summons a monster, you can activate this.
[EFFECT] Choose 1 Level 4 Spellcaster monster in your GY and Special Summon it to your field in face-up Attack Position. Then, you can choose up to 3 Attack Position monsters you control and change them to face-up Defense Position, including “Magician’s Valkyria”. During this turn, while the monsters that were changed to Defense Position by this effect are in face-up Defense Position, they cannot be destroyed by battle.
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