OMG at Palkia and Dialga Legend. Palkia is known for board control and bench manipulation while dialga is known for stalling and locking down passive elements of the game. Put those 4 qualities together and what do you have? ....something that has x4 weakness to Raikou_Entei Legend. lol
also at red blastoise, when an attack, trainer, supporter, etc... has a very good effect, the cost is normally really bad. Think of Cynthia, you get 8 cards but at the cost of a prize card (your opponent). Now think of Arceus Dark, who does 60 for 2 energy if you are down on prizes. I am trying to get at the fact that with a cost as big as "Losing at the game" the reward is sure to be monumental. Add to that the fact that you can't use other supporter the turn you play it (because it is a supporter).