Target 1 "Dark Magician" or "Dark Magician Girl" in your field or GY; Fusion Summon 1 Fusion Monster from your Extra Deck that mentions that monster as material, by shuffling it into the Deck as material (this is treated as a Fusion Summon with "The Eye of Timaeus"), but banish it during the End Phase of the next turn. You can only activate 1 "The Gaze of Timaeus" per turn.