Its only when the plan gets scuttled that Ariel gets it back
Traps didn't change at all
Gyarados, unfortunately, is costly to use given that its main move requires four Energy, but they do discard your opponents Active Pokemons Energy which can be useful
Its already a solid draw spell for two cards on its own, but if you have a Jace planeswalker on the field, it scales up to three
Some powerful item combinations make their way into the game, as do some great action cards such as Light the Fuse
Stadium cards are typically dependent on the deck you choose to run, so a Water deck might play a stadium to heal its Water Pokmon each turn, while another deck may be a mix of types and not even need Stadium cards