It is notable that from the footage I have watched of his Top 8 game against Miguel Garcia that he did not use any Call Energy, which suggests that he did not play it in his deck
If an effect instructs you to transform a modal double-faced card on the battlefield, it transforms only if its other face has a permanent type (that is, if its other face isn't an instant or sorcery)
If this card in its owner's possession is destroyed by an opponent's attack or card effect: Take 2000 damage, then inflict 2000 damage to your opponent
You won't find one of these in good condition falling below $5000 and the highest it can go is $10,000 in the best condition
This isn't a problem if we use Pokmon that attach energy cards to other Pokmon rather explosively, such as Dragonite UNM 151 itself, which attaches one Basic Water Energy sv2 279 and one Basic Lightning Energy sv1 257 at a time, which means we'll need two Dragonite UNM 151