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They were available for pre-order from September 18, 2023, through November 6, 2023, exclusively through the Secret Lair website

(1) If Necrovalley is on the field: You can Fusion Summon 1 Spellcaster Fusion Monster from your Extra Deck, using monsters from your hand or field as Fusion Material, including this card on the field

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What are Qualifiers

This event is called a Chain

Before this change, Wizard Mentor was a first pick card which could save your creatures from creature kill spells, allow you to reuse the bevy of 187 creatures in the format (Ghitu Slinger, anyone?), and at worst case scenario allow you to play emergency defense