Were going to find a better, more simple solution to this problem for Commander
It's a good attacker or blocker, and it creates more creatures for you over time
Having a mana pool that's designed to hold colorless, RGUBW and snow mana is a violation

Abstract Paintmage Alania, Divergent Storm Balmor, Battlemage Captain Baxter Stockman Breeches, the Blastmaker Bria, Riptide Rogue Captain Howler, Sea Scourge Captain Storm, Cosmium Raider Colorstorm Stallion Don & Raph, Hard Science Dragonfly Swarm Eclipsed Flamekin Effortless Master Elemental Mascot Enigma Drake Fearless Swashbuckler Flaring Cinder Gadget Technician Gleaming Geardrake Intruding Soulrager Iron Man, Master of Machines Johann, Apprentice Sorcerer Kraum, Violent Cacophony Kylox, Visionary Inventor Lilah, Undefeated Slickshot Malcolm, the Eyes Melek, Reforged Researcher Mm'menon, Uthros Exile Mouser Mark III Niv-Mizzet, Visionary Nobody North Wind Avatar Ovika, Enigma Goliath Pinnacle Emissary Prismari, the Inspiration Professor Zei, Anthropologist Saheeli, the Sun's Brilliance Sanar, Innovative First-Year Sanar, Unfinished Genius Shantotto, Tactician Magician Sokka, Bold Boomeranger Spectacular Skywhale Speedball, New Warrior Spider-Man 2099 Stadium Tidalmage Stormcatch Mentor Tellah, Great Sage Tempest Angler The Emperor of Palamecia The Invincible Iron Man The Lord Master of Hell Twinflame Travelers Uharis, the Stormspinner Zaffai and the Tempests

While controlling another player, you can see all cards in the game that player can see
While a certain Felidar Sovereign can win with 40 life, as a creature, it's much more vulnerable as every deck can answer creatures, so they can answer it, and thus I find the Test of Endurance to be more reliable for the turn or so before you win with it