Mewtwo (Black Star Promo #12 and #14) represent the early promotional era of the Pokemon TCG, when cards were distributed through an eclectic and sometimes bewildering array of channels including magazines, mail-order promotions, league participation rewards, and retail partnerships
The +1,000 Power can save you from committing to many Counter cards, and youre going for stronger attacks, getting more Counter cards from your opponent
Assemble the Players lets you look at the top card of your deck at anytime, giving you the opportunity to manipulate and exchange them with the help of other cards like Senseis Diving Top
Even better, Single Strike Roar can be used once for each Houndoom you have in play meaning you could theoretically attach four Single Strike Energy with your Houndoom in a single turn
The biggest problem with Epic Struggle is that it does nothing until it wins the game