Mirage Monsters are type of monsters that is part of your Extra Deck. Their based color are Gold.
Originally, Mirage Monsters are like Xyz Monsters. However, the only difference is that Xyz Monsters can be summoned by combining the number of monsters with the same level while Mirage Monsters can be summoned by combining the number of monsters with the same attribute.
Mirage Monsters don't have Levels or Ranks. Their specialty is that they have an attribute that is shining bright.