2023 pokémon card 151 Pokemon Pok Scarlet Violet Ultra Premium Collection Violet—151 expansion! Pokemon 2023 SV2a Pokemon Card

Aang, Air Nomad Aang, the Last Airbender Abbey Gargoyles Abbey Griffin Absolving Lammasu Abzan Falconer Abzan Skycaptain Acrobatic Cheerleader Adarkar Valkyrie Ademi of the Silkchutes Admonition Angel Aegis Angel Aerial Extortionist Aerial Responder Aerial Toastmaster Aerialephant Aerie Auxiliary Aerie Mystics Aeronaut Admiral Aeronaut Cavalry Aetherstorm Roc Ageless Sentinels Air Nomad Student Airdrop Aeronauts Airlift Chaplain Akroan Skyguard Akroma, Angel of Wrath Akroma, Vision of Ixidor Alabaster Dragon Alabaster Kirin Alaborn Musketeer Alharu, Solemn Ritualist Amazing Spider-Girl Ambush Paratrooper Ancestor Dragon Ancient Gold Dragon Angel of Condemnation Angel of Deliverance Angel of Destiny Angel of Finality Angel of Flight Alabaster Angel of Fury Angel of Glory's Rise Angel of Grace Angel of Indemnity Angel of Invention Angel of Jubilation Angel of Light Angel of Mercy Angel of Renewal Angel of Retribution Angel of Salvation Angel of Sanctions Angel of Serenity Angel of Vitality Angel of the Dawn Angel of the Dire Hour Angel of the God-Pharaoh Angel of the Ruins Angelic Aberration Angelic Arbiter Angelic Cub Angelic Curator Angelic Enforcer Angelic Field Marshal Angelic Guardian Angelic Observer Angelic Overseer Angelic Page Angelic Protector Angelic Quartermaster Angelic Sell-Sword

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

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