The Eye of Timaeus

Normal Spell

(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.

Rulings – Yugipedia

Printings:

Dragons of Legend: DRLG-EN005 (Secret Rare) - 2014-04-25
Dragons of Legend: Unleashed: DRL3-EN045 (Ultra Rare) - 2016-08-18
Legendary Dragon Decks: LEDD-ENA21 (Common) - 2017-10-05
Dragons of Legend: The Complete Series: DLCS-EN007 (Ultra Rare) - 2020-09-10
Ghosts From the Past: The 2nd Haunting: GFP2-EN183 (Ghost Rare) - 2022-05-05
Quarter Century Stampede: RA04-EN192 (Platinum Secret Rare) - 2025-04-10
Quarter Century Stampede: RA04-EN192 (Quarter Century Secret Rare) - 2025-04-10

Prices:

Cardmarket: 0.78 €
TCGplayer: $ 2.19