Unfortunately, the 3 energy cost is a bit heavy (and even dealing 100 damage if you use the Future Capsule, it is still low damage), but we can include it in a build with Baxcalibur and Suicune ex, so Suicune ex buys time by drawing cards, and toward the end of the game, it can finish off an opponent's Pokmon by dealing more damage (20 for each Pokmon on the bench, counting yours and the opponent's, which can reach 120 damage for just 2 energy)

Abuna Acolyte Adorable Kitten Adorned Pouncer Aetherstream Leopard Ajani's Chosen Ajani's Pridemate Ajani's Sunstriker Ajani, Nacatl Pariah Alacrian Jaguar Alms Collector Angelic Cub Arahbo, Roar of the World Arahbo, the First Fang Arcbound Mouser Arcbound Shikari Arcbound Slasher Arctic Nishoba Armored Guardian Armored Skyhunter Balan, Wandering Knight Bane-Marked Leonin Basri's Acolyte Bast, Panther Goddess Black Cat Black Market Tycoon Blade of the Sixth Pride Blistering Firecat Bola Slinger Bounding Felidar Brimaz, Blight of Oreskos Brimaz, King of Oreskos Brokers Initiate Bronzehide Lion Cait Sith, Fortune Teller Canopy Stalker Canyon Wildcat Cat Warriors Cat-Owl Cauldron Familiar Cave Tiger Chandra's Embercat Charmed Stray Chartooth Cougar Chrome Cat Chrome Prowler Civil Servant Coeurl Crazed Firecat Cruel Caracals Cubwarden Dawnwing Marshal Denry Klin, Editor in Chief Diamond Lion Displacer Beast Displacer Kitten Dreadmalkin Eager Glyphmage Elite Cat Warrior Emeritus of Truce Enduring Curiosity Enlightened Ascetic Entrails Feaster Envoy of Okinec Ahau Falthis, Shadowcat Familiar Felidar Cub Felidar Guardian Felidar Savior Felidar Sovereign Feline Sovereign Feral Maaka Feral Prowler Ferocious Tigorilla

The only thing holding these back is that theyre essentially sideboard cards, albeit really good ones situationally
Its in the nature of the game that a strategy cant be optimal for both players
Still, the pool of decks that can use this is a small one
In the Japanese version the right door goes to the arena, while the left door leads to a special e-Reader area where players can scan in extra cards to battle additional trainers and capture three more Shadow Pokmon