If you miss the window for ordering a set or want one of the older editions, youll have to try your luck with eBay or another third-party seller
You need to mill people, which is quite the tall order in Commander

Advanced Search Sets Random Syntax Academy Rector Aerial Surveyor Alabaster Host Intercessor Ambitious Farmhand Amrou Scout Angel of the Ruins Angel's Herald Archaeomancer's Map Arena Rector Auratouched Mage Basri's Aegis Battalion Foot Soldier Boonweaver Giant Boreas Charger Borough Backup Call the Gatewatch Captain America, Liberator Cartographer's Hawk Charitable Levy Claim Jumper Clay-Fired Bricks Cloud, Midgar Mercenary Cloudbound Moogle Daru Cavalier Deep Gnome Terramancer Defiant Falcon Defiant Vanguard Delivery Moogle Djeru, With Eyes Open Do-It-Yourself Seraph Eagles of the North Elspeth's Devotee Elspeth, Undaunted Hero Emergency Eject Endless Horizons Enduring Ideal Enlightened Tutor Eternal Dragon Fall to Earth Forerunner of the Legion From Father to Son Gathering Throng General Tazri Gideon's Battle Cry Gideon's Resolve Gift of Estates Gleam of Resistance Gloryheath Lynx Goldmane Griffin Grand Master of Flowers Guardian Sunmare Heliod's Pilgrim Honored Knight-Captain Idyllic Tutor Ignite the Beacon Invasion of Theros Jennika, Bad Apple Big Sister Kayla's Command Keeper of the Accord Kellan, the Fae-Blooded Kithkin Harbinger Knight of the White Orchid Kor Cartographer Land Tax Landscaper Colos Legion Conquistador Light-Paws, Emperor's Voice Lin Sivvi, Defiant Hero Lost Auramancers Loyal Warhound Magitek Infantry Moon-Blessed Cleric

There's even ripe potential for multiple Sephiroth cards
Well just have to wait for our moment after the dust has cleared from some battlefield sweeper and then rise up to the highest peak