Recent sets worth checking for AR hunting: SV10 Heat Wave Arena, SV9 Battle Partners, and M4 Mega Symphonia
As far as I know the real source is known to WOTC and was shut down once before, reopening their business shortly after that under a new name
Act of Aggression Act of Treason Admiral Beckett Brass Agent of Treachery Aladdin Amped Up Angrath, the Flame-Chained Archmage's Charm Aura Graft Awaken the Sleeper Beguiler of Wills Besmirch Binding Grasp Blatant Thievery Bloody Betrayal Blue Sun's Twilight Bond of Passion Callous Oppressor Captivating Crew Captivating Vampire Catch // Release Catch // Release Caught Red-Handed Chamber of Manipulation Chef's Kiss Claim the Firstborn Coercive Recruiter Commandeer Connive // Concoct Connive // Concoct Conquer Conquering Manticore Control Magic Coveted Falcon Cunning Bandit Cunning Bandit Cytoplast Manipulator Dack Fayden Dominate Dominating Vampire Dominus of Fealty Dragonlord Silumgar Edea, Possessed Sorceress Eldrazi Obligator Empress Galina Emrakul, the Promised End Enthralling Victor Entrancing Melody Eriette's Tempting Apple Evangelize Evil's Thrall Exert Influence Firbolg Flutist Flayer of Loyalties Furnace Reins Garland, Royal Kidnapper Geyadrone Dihada Giant's Grasp Glen Elendra Goatnap Govern the Guildless Grab the Reins Grip of Phyresis Grishnkh, Brash Instigator Hammer Helper Helm of Possession Hijack Hivis of the Scale In Thrall to the Pit Incessant Provocation Infernal Captor Infernal Denizen
Ultimately, a lot of explorations were either too mundane to get that sense of adventure or a full minigame that was too much to keep track of alongside the Magic game (or fit on the table)
It's only been printed in one set, nearly a decade ago, and it's incRedibly powerful
