Venomoth GX could be played with Janine, Koga and Surge all in one to OHKO anything + being protected against stuff like Blacephalon the next turn. Its a lot to ask for but not impossible since Janine lets you "search" Cards from top and we have Cards like Lele.
I think ist unlikely they Reprint a DDE or even print a new "Dragon Energy". ALl of the new Dragon types only Need one type of energy instead of two different ones. So a "Single Dragon Energy" wouldn`t make sense and DDE could be too OP for things like Dialga etc... just my two cents