about master miracle cubes

Since when can a rating jump from rare to unique? That is new to me. o_o

A Master Miracle Cube can change the rating from rare to epic to unique to legendary.
The only cube that can change the rating to legendary is a Master Miracle Cube. A normal Miracle Cube can only change the rating to unique.

You can get unique on first reveals? Isn't that basically the same thing? I got two unique items without cubing them.