Reidane's Shield is valuable to locking down damage and countering targeting effects from everything from Shriekmaw to Swords to Plowshares to Oko, Thief of Crowns unless they spend a mana tithe

Decklist: Rad Counters in Commander Commander (1) Creature (28) Cathedral Acolyte Piper Wright, Publick Reporter Vexing Radgull Winding Constrictor Feral Ghoul Glowing One Hancock, Ghoulish Mayor Infesting Radroach Raul, Trouble Shooter Tato Farmer Watchful Radstag Harold and Bob, First Numens Jason Bright, Glowing Prophet Rampaging Yao Guai Tireless Tracker Bloatfly Swarm Corpsejack Menace Lily Bowen, Raging Grandma Nightkin Ambusher The Master, Transcendent Young Deathclaws Marcus, Mutant Mayor Mirelurk Queen Alpha Deathclaw Screeching Scorchbeast Strong, the Brutish Thespian Agent Frank Horrigan Lumbering Megasloth Instant (7) Biomass Mutation Contaminated Drink Inspiring Call Mutational Advantage Putrefy Atomize Radstorm Sorcery (6) Farseek Nuclear Fallout Rampant Growth Cultivate Harmonize Casualties of War Enchantment (8) Hardened Scales Branching Evolution Fraying Sanity Guardian Project Struggle for Project Purity Inexorable Tide Vault 12: The Necropolis Vault 87: Forced Evolution Artifact (10) Sol Ring Arcane Signet Contagion Clasp Nuka-Nuke Launcher Power Fist Talisman of Curiosity Talisman of Dominance Talisman of Resilience Strength Bobblehead Recon Craft Theta Land (39) Darkwater Catacombs Drowned Catacomb Exotic Orchard Fetid Pools Hinterland Harbor Nesting Grounds Sunken Hollow Temple of Deceit Temple of Malady Temple of Mystery Woodland Cemetery Ash Barrens Command Tower Evolving Eilds Mortuary Mire Opulent Palace Path of Ancestry Tainted Isle Tainted Wood Temple of the False God Terramorphic Expanse Mariposa Military Base Overflowing Basin Viridescent Bog Swamp x5 Forest x5 Island x5 The best place to get a feel for how to use rad counters in Commander is the Mutant Menace Fallout precon

Follow along with your cards and find the game title next to the collector number

Aftermath Analyst Beast-Kin Ranger Bloom Tender Boughside Wanderers Cantankerous Keepers Cautious Survivor Champions of the Perfect Cryptid Inspector Dawn's Light Archer Druid of the Cowl Dwynen's Elite Dwynen, Gilt-Leaf Daen Elvish Archdruid Elvish Archivist Elvish Refueler Elvish Regrower Emeritus of Abundance Emil, Vastlands Roamer Ferocious Werefox Fierce Empath Formidable Speaker Galion, Elvenking's Butler Greenbelt Guardian Guardian of the Halls Hedge Whisperer Imperious Perfect Llanowar Elves Lys Alana Dignitary Lys Alana Informant Mirkwood Pathmaker Moon-Vigil Adherents Morcant's Eyes Overgrown Zealot Reclamation Sage Redtooth Genealogist Redtooth Vanguard Safewright Cavalry Selfless Safewright Sentinel of Lost Lore Springbloom Druid Tajuru Pathwarden Thornfist Striker Thornweald Archer Topiary Lecturer Trystan, Callous Cultivator Tyvar, the Pummeler Vinebred Brawler Virulent Emissary Vitu-Ghazi Inspector Wildborn Preserver Wildheart Invoker Wood Elves Woodland Weavemaster

The reason is very simple: There is no Volcanic Island in Alpha, so the Beta Volcanic Island is actually its first print ever