Talk:Mirror Dragon/@comment-217.121.212.144-20130826220715/@comment-1321146-20130829130111

It may have 3 filled spheres on the bottom of the card, but it is still named "Heaven's Mirrror Dragon", not "Heaven's Mirrror Dragon++".

The 4 spheres on the Mirrror Dragon are used differently than they are on normal cards. They do not represent an evolved version of the card.

They instead represent the rarity of the card:
 * 1 sphere = Rare.
 * 2 spheres = Super Rare.
 * 3 Spheres = Mega Rare.
 * (Leaving room for a theoretical future Ultra Rare Mirrror Dragon)