1. You'll need to live long enough to attach that much energy onto Rayquazza
2. You'll need to get a setup going before you can afford to throw away your hand
3. What happens when they KO your Rayquazza?
I've tried that sort of a deck, and it is really clunky to get going... by the time I got the combo set up, I was frequently at least 3 Prize cards behind.
Tried it, it's too slow to be good. People wanted to use this combo when SV first came out, it proved that it got destroyed by everything then and Claydol's rotation certainly isn't going to help with that. The problems are...
A. You need to get it charged in the first place, which is a real chore.
B. You can discard all the cards from your hand to avoid an energy discard... but then you have no hand.
C. You lose when a Quaza dies.
Rayquaza C & Electivire FB. There was a deck like this that top cut at BR's. Fluke? Idk. Obviously it had SOME sort of consistency. 200 every other turn seems fun.