Secrets of Strixhaven Commander

Sorcery

Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.)
Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.)

Throes of Chaos

This is the actual decklist that I own.
Draft the Commanders first from a special pool (in the sideboard) with 4 packs of 10 or 12.
Each commander has partner. If you want to use one of the companions, you can do that as well if you abide by the companion rules and color identity rules. For Umori specifically, you may still have creatures as your commanders as long as the rest of the deck follows its companion rules.
I suggest choosing your commanders (and sometimes a companion) before you've drafted from the main pool. 
Each player automatically gets a command tower and an arcane signet.
Before drafting, players can decide if they want to draft 60 card commander decks or full-sized 100 card decks.
Draft 4 packs of 14 for 60 card decks and 6 or 7 packs of 14 for 100 card decks.
Color Identity does not matter when it comes to lands.
Draft Archetypes:
Reanimator
Cast spell, get value
Freecasting
Theft
Copying spells
Value for targeting your own creatures

(The Real) Budget Spellslinger Commander Cube

Live Tome and Prosper

Heli-thopter, Heli-thopter

Source: http://magic.wizards.com/en/news/announcements/secrets-of-strixhaven-commander-decklists

Prismari Artistry (Secrets of Strixhaven Commander Preconstructed Deck)

Gandalf

Mulligan until you get some sort of ramp, attach Keen Sense or Snake Umbra to Borborygmos, deal 3 damage per land in your deck.

Borby's Bashing

Source: https://magic.wizards.com/en/news/announcements/magic-the-gathering-doctor-who-commander-decklists

Paradox Power (Doctor Who Preconstructed Commander Deck)

Source: https://magic.wizards.com/en/news/announcements/adventures-forgotten-realms-commander-decklists-2021-07-09

Throes of Chaos

Rules Text

Card Facts

Legality

Rulings

Every version

Decks using this card