Just a quick ad showing some of the key cards from Dragons of Legend.
This shows us that The Eye of Timaeus is a Spell Card. Its text appears to be:
The Eye of Timaeus
(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 a Fusion Material Monster, using it as the Fusion Material. You can only activate 1 “The Eye of Tiameus” per turn.