2023 pokémon card 151 Pokemon Pok Scarlet Violet Ultra Premium Collection New adventures will unfold and new horizons will be revealed in the Scarlet MEWTWO | 2023 POKEMON JAPANESE

Beastbreaker of Bala Ged Brimstone Mage Caravan Escort Champion's Drake Coralhelm Commander Echo Mage Enclave Cryptologist Guul Draz Assassin Hada Spy Patrol Halimar Wavewatch Hedron-Field Purists Hexdrinker Ikiral Outrider Joraga Treespeaker Kabira Vindicator Kargan Dragonlord Kazandu Tuskcaller Knight of Cliffhaven Lighthouse Chronologist Lord of Shatterskull Pass Nirkana Cutthroat Null Champion Skywatcher Adept Student of Warfare Transcendent Master Venerated Teacher Zulaport Enforcer

Some are just cycling filler cards to help shrink the deck and fill up the yard in a nicely distributed delirious way

The Golgari side sacrifices a dork you control to recur one card per color from your graveyard to your hand

How thick are toploaders

My first guess was that it's a set that focuses on battles between different Mega Evolution Pokmon, like the old EX Team Magma vs Team Aqua set, though why the letter X was chosen instead of V or VS beats me