So my very last entry in my Pythian blog, before I joined Oracle, I talked about what happens if you try to recover a PLUGGABLE DATABASE if you do a DROP PLUGGABLE DATABASE in 12cR1, long story short (Also a joke if you watch ...
The other day I had a client that when planning his backup solution he wanted to take snapshots of his DG environment and from that clone to his Dev/QA environments. So below is the result of that, which is probably really nothing you have not seen.