Note that this Oracle text reads Snow Swamps, not Snow-Covered Swamps, so you should be able to count the Snow Swamps duals in Kaldheim
Tribal Reanimator Commanders (Scion of the Ur-Dragon, Horde of Notions, Gisa and Geralf, Kaalia of the Vast, etc.) There are a LOT of commanders well suited to tribal reanimator strategies, but the 4 I have listed here exemplify what you should be looking for when narrowing down which legendary creature should be at the helm
In fact, five-color cards are some of the most popular and best Commanders in the entire format
Marvel, Kamala Khan Nerd Rage Nezahal, Primal Tide Niv-Mizzet, Visionary Nyssa of Traken Power Without Equal Praetor's Counsel Proft's Eidetic Memory Reed Richards, Smartest Man Reliquary Tower Roaring Furnace // Steaming Sauna Sea Gate Restoration Spellbook Spirit Water Revival Stairs to Infinity Tamiyo, Seasoned Scholar Tamiyo, the Moon Sage The Great Synthesis The Lux Foundation Library The Magic Mirror The Second Doctor Thought Vessel Tishana, Voice of Thunder Triskaidekaphile Undercity Reaches Venser's Journal Vnwxt, Verbose Host Wisdom of Ages Wizard Class Wrenn and Seven Your Puny Minds Cannot Fathom
Spells such as Austere Command, Abrade , Sublime Epiphany, etc
The downside is that since Marvin is a colorless creature, running him as your commander severely limits the cards you have access to with strong activated abilities