With dark monsters in Yu-Gi-Oh

Adriana, Captain of the Guard Adult Gold Dragon Agrus Kos, Spirit of Justice Agrus Kos, Wojek Veteran Akiri, Fearless Voyager Akiri, Line-Slinger Akroan Hoplite Alibou, Ancient Witness Alibou, Ancient Witness Alpine Houndmaster Anax and Cymede Angelic Captain Anim Pakal, Thousandth Moon Anya, Merciless Angel Arabella, Abandoned Doll Araa, Heart of the Spider Arbaaz Mir Arcbound Shikari Arcee, Sharpshooter Armory Paladin Asari Captain Ash, Party Crasher Astor, Bearer of Blades Aurelia, Exemplar of Justice Aurelia, the Law Above Aurelia, the Warleader Aurelia, the Warleader Aya of Alexandria Aziza, Mage Tower Captain Baird, Argivian Recruiter Balefire Liege Banon, the Returners' Leader Basandra, Battle Seraph Battlegate Mimic Bayek of Siwa Bell Borca, Spectral Sergeant Belligerent Hatchling Black Widow, Agile Avenger Blade Historian Blaze Commando Boros Battleshaper Boros Challenger Boros Guildmage Boros Reckoner Boros Recruit Boros Strike-Captain Boros Swiftblade Bre of Clan Stoutarm Brion Stoutarm Bruenor Battlehammer Bruse Tarl, Boorish Herder Bruse Tarl, Boorish Herder Bruse Tarl, Roving Rancher Bull Cerodon Bureau Headmaster Cadric, Soul Kindler Caparocti Sunborn Captain Marvel, Apex Avenger Captain Rex Nebula Cass, Hand of Vengeance Catharsis Cautery Sliver Cerodon Yearling Cloud, Planet's Champion Cloudshredder Sliver Cloudspire Coordinator Colossus of the Blood Age Commander Liara Portyr Commander Mustard Conduit Goblin Cori Mountain Stalwart Craig Boone, Novac Guard

60% scored 9 or higher, so clean copies are common and centering usually decides the top grades
Choose 1 of those players to run the game
The goal was to earn cards by going above and beyond expectations (i.e., doing something nice for someone, meeting behavioral goals) and trading cards with peers until a full set was made
If multiple players have Auras to put onto the battlefield, the player whose turn it is announces what their Auras will enchant, then each other player in turn order does the same, then all enchantments (both Auras and non-Auras) enter at the same time