Each player can Special Summon 1 DARK Spellcaster monster from their hand or Deck (but neither player can activate their effects this turn), then if you Special Summoned a monster whose original name is "Dark Magician" or "Dark Magician Girl", you can add 1 Spell/Trap that mentions "Dark Magician" from your Deck to your hand, except "Dark Magical Curtain". You can only activate 1 "Dark Magical Curtain" per turn.