Witchcraft Master Verre DBIC-JP019 Secret Rare

During damage calculation, if your Spellcaster monster battles an opponent's monster: You can reveal any number of Spells in your hand with different names, and if you do, your battling monster gains 1000 ATK/DEF for each revealed card until the end of this turn. (Quick Effect): You can discard 1 Spell; negate the effects of all face-up monsters your opponent currently controls until the end of this turn. You can only use each effect of Witchcraft Master Verre once per turn.

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