Special Guests

Sorcery

Search your library for up to three monocolored cards with different names and exile them. An opponent chooses one of those cards. Shuffle that card into your library. You may cast the other cards without paying their mana costs. Exile Emergent Ultimatum.

Emergent Ultimatum

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

Here's the decklist for the version I own.
Cards pilfered from this one: https://manytcg.com/decks/cmkrylv690001ju04sti536ox
Think imma proxy some from the considering tab...until I get them...maybe

My Bad Decklist Thrown Together in a Cave with a Box of Scraps

Grosse Infection

The Song that Never Ends

EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE

Yidris' Cheese Shoppe

Sorry, Can't Lose the Game. Mom Said No...

This deck charts the path of these two young mages to becoming liches. They of course achieve this thorugh ritual sacrifice. Enjoy!

Emergent Ultimatum

Rules Text

Card Facts

Legality

Rulings

Every version

Decks using this card