Board Thread:News and Announcements in game/@comment-32378690-20170706001725/@comment-27996636-20170719141206

It says UR in the description and UR are pre exsisting cards, we never get UR summoned so it must mean that.

Seems strange that they would describe how a LR becomes LR from UR in the promotion, that would be some real bad translating, these are Bandai employees doing the translating, I have trust in them.