Believe it or not Jono, it is actually quite fun. If you read the Power it says Energy Cards meaning it can recover Special Energy, which gives a boost to certain types. As you know Metal decks use Conductive Quarry to recover their Special Metal Energy, Special Darkness has nothing. This means that this could be run with Flygon/Weavile or with Absol G. Its attack is also fantastic, it attacks with Energy, just like Leafeon Lv.X. Meaning that this could potentially become one of the biggest hitters in the format.