Delcatty and claydol.
Put energy on top your deck and then draw into them.
Or you can wait till hg/ss comes out nd play fisherman,to grab 4 energy from your discard pile and put them in your hand.
You probably won't be using Graveler for so long, but the AR one is best because its more reliable. Bronzong SF helps get energy from your deck. Excellent if you are playing 20 energy, but not so good if you are only playing 10.
In this deck I think 15-16 would be a good number, since you are discarding it, unless you also use Delcatty PL. I personally wouldn't, I'd just run a lot of energy recovery cards (Night Maintenance, maybe even Energy Restore).