The Official Website reveals the card!
Quick-Play Spell Card
(1) Apply these effects, in sequence, depending on the total number of copies of “Dark Magician” and “Dark Magician Girl” on the field and in the Graveyards.
• 1 or more: 1 DARK Spellcaster-Type monster on the field gains 1000 ATK until the end of this turn.
• 2 or more: This turn, your opponent cannot activate cards or effects in response to the activations of your Spell/Trap Cards and effects, also Spell/Trap Cards you control cannot be destroyed by your opponent’s card effects.
• 3 or more: All DARK Spellcaster-Type monsters you control are unaffected by your opponent’s card effects until the end of this turn.