I've been testing PlasmaKlang/Mewtwo recently, and I liek it. I didn't like the normal version of this deck, but this version is actually good. Mewtwo can clean up non EX attackers and Keldeo + DCE is an easy way to get out of catcher lock. Mewtwo also OHKOs Victini, and since many people wouldn't normally bench Mewtwos down against Klingklang, you won't normally be revenge KOd. And even if you are, Cobalion EX walls Mewtwo, so it is another thing you can KO. Its also great against Garbodor decks because you can take early KOs on Trubbish.