Secrets of Strixhaven Promos

Sorcery

Target player draws 2ˣ cards. (2⁰ = 1, 2¹ = 2, 2² = 4, 2³ = 8, 2⁴ = 16, 2⁵ = 32, and so on.)

Mathemagics

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

Prismari Be Slangin’ It

This deck exists to give everyone everything they've ever wanted.
The switcheroo type spells are just here for funny pranks that make your opponents exchange gifts.
The only way this deck wins is by forcing opponents to draw out their decks, however, the game should be over by then. Also, lots of lands because this deck is mainly here to let other people play cool stuff; if all we can do is put an extra land down with Braids, that's ok. Overall, this deck should be a wild ride in most pods...unless you get targeted because Braids really should never stay on the battlefield. The extra amount of lands are there to help recast Braids should she die.

Mathemagics

Rules Text

Card Facts

Legality

Rulings

Every version

Decks using this card