While you cant take Universes Beyond cards to a tournament, a simple Rule Zero conversation with your opponent is all you need to use them in home games

Akroan Crusader Akroan Sergeant Ballista Watcher Barbarian General Barbarian Horde Barging Sergeant Bomber Corps Brambleguard Captain Branded Brawlers Capital Guard Ceremonial Guard Cleon, Merry Champion Conscripted Infantry Dong Zhou, the Tyrant Dwarven Lieutenant Dwarven Soldier Erkenbrand, Lord of Westfold Fallaji Chaindancer Farid, Enterprising Salvager Fault Riders Fire Bowman Fire Nation Cadets Fire Nation Raider Fire Nation Soldier Firebrand Ranger Firefist Striker Fireflux Squad Flailing Soldier Forerunner of the Empire Frontline War-Rager General Kreat, the Boltbringer General Traag, Heart of Stone Gerrard's Irregulars Goblin Banneret Grishnkh, Brash Instigator Hanweir Garrison Harried Spearguard Heartfire Hero Hero of the Games Heroes of the Revel Impetuous Sunchaser Independent Troops Kav Landseeker Kavaron Harrier Kavaron Skywarden Keldon Arsonist Keldon Berserker Keldon Firebombers Kobold Drill Sergeant Legion Loyalist Legion Warboss Lightning, Security Sergeant Lu Bu, Master-at-Arms Ma Chao, Western Warrior Manifold Mouse Markov Enforcer Memorial Team Leader Mirage Phalanx Mountain Bandit Olog-hai Crusher Opportunist Orcish Siegemaster Ordruun Commando Orthion, Hero of Lavabrink Ravaging Horde Renegade Troops Renegade Warlord Roc Hunter Rock Soldiers Sandstone Warrior Satyr Hoplite Shock Brigade

While Clefairy is beloved by many, and the card art is lovely, it's not like this is an iconic Pokemon
The Pokemon series has taken its games all across the world with each entry being inspired by a real-world location giving us Pokemon that are etched with real world culture and details
I looked for a used one on Ebay and found one for about $60