The Eye of Timaeus - DLCS-EN007 Ultra Rare 1st Edition

(This card is also always treated as "Legendary Dragon Timaeus".) Target 1 "Dark Magician" monster you control; Fusion Summon 1 Fusion Monster from your Extra Deck that lists that monster on the field as Fusion Material, using it as the Fusion Material. You can only activate 1 "The Eye of Timaeus" per turn.