The first is an Amber and Emerald deck themed around Peter Pan and 101 Dalmatians (plus other Disney dogs), while the second is a Ruby and Sapphire deck based on Duck Tales, with a side order of Moana
Overall, "Power of the Elements" is one of the game's best sets of all time , and it greatly changed the power level of the modern game
It might seem odd to cut Aether Gust against a deck with Nissa, Who Shakes the World and Casualties of War but they have a bunch of discard which makes it a lot worse plus the games often grind for a long time and delaying their good card doesnt actually get you anywhere
Both versions contain the same 127-card set list and identical gameplay
Flutter Mane , like Klefki, has an extremely potent ability in its Midnight Fluttering Ability, which shuts off all of the Abilities of your opponents Pokmon when it is in the Active Spot