Carnivine can hit for 50 damage with just one energy when Arceus and Arceus ex are in play, a damage range typically only achieved by evolutions like MI Primeape for the same energy cost
Pikachu Ex 20th Anniversary Another highly prized Japanese-only Pokmon Ex card
Unless they win the game on the spot, or they have some addition to the card, (such as the milling added to the countering of Induce Paranoia) the vast majority of these cards are card disadvantage
If the first attack knocks out the opponents Active mon, the second attack hits the next Active Pokmon, essentially doubling up on your turn
One reason for this is that the deck is full of good cards, most of which have a lot of play to them
Cards 8392, which include the Pokmon-ex and the Gold Stars, are locked to a single holo printing