Also, since this is a Commander-only card, it gives us no indication as to whether or not adventures will be a main set mechanic
The token copy that Saheeli, Radiant Creator makes is sacrificed at the end step

Advanced Search Sets Random Syntax Release date: 2012-10-05 Angel of Serenity Armory Guard Arrest Avenging Arrow Azorius Arrester Azorius Justiciar Bazaar Krovod Concordia Pegasus Ethereal Armor Eyes in the Skies Fencing Ace Keening Apparition Knightly Valor Martial Law Palisade Giant Phantom General Precinct Captain Rest in Peace Rootborn Defenses Security Blockade Selesnya Sentry Seller of Songbirds Soul Tithe Sphere of Safety Sunspire Griffin Swift Justice Trained Caracal Trostani's Judgment Aquus Steed Blustersquall Cancel Chronic Flooding Conjured Currency Crosstown Courier Cyclonic Rift Dispel Doorkeeper Downsize Faerie Impostor Hover Barrier Inaction Injunction Inspiration Isperia's Skywatch Jace, Architect of Thought Mizzium Skin Paralyzing Grasp Psychic Spiral Runewing Search the City Skyline Predator Soulsworn Spirit Sphinx of the Chimes Stealer of Secrets Syncopate Tower Drake Voidwielder Assassin's Strike Catacomb Slug Cremate Daggerdrome Imp Dark Revenant Dead Reveler Desecration Demon Destroy the Evidence Deviant Glee Drainpipe Vermin Grave Betrayal Grim Roustabout Launch Party Mind Rot Necropolis Regent Ogre Jailbreaker

Yes, you lose some life every turn, but The One Ring is also indestructible, making it extremely difficult for your opponents to interact with, and you really should have some bounce spells to maximise the potential of The One Ring (and to not lose too much life)
The biggest downside to this card is the high casting cost and the equip