Ruling Unown E

[mattlax]

Can someone tell me what this does please?
And what set it's from?

Thanks in advance.

 

[StealthAngel667]

 

[xxashxx]

It is like Plus Power that gives you 10 extra HP. You can discard all cards and use it like Plus Power or you can leave it the way it is and use Hidden Power. I would do this if your Pokemon is almost ready to get knocked out.