Like Effect Veiler but Smug. And AoE.

Update:  We believe her name is Verre

Witchcraft Master Verre
Light Spellcaster / Effect
LV8 1000/2800
You can only use this card name’s (1) and (2) effects once per turn each.
(1) During damage calculation, when a Spellcaster monster you control battles an opponent’s monster: You can reveal any number of Spells with different names from your hand, and if you do, that monster you control gains 1000 ATK/DEF for each card revealed until the end of this turn.
(2) (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.

Source