This isnt the only way you can build Muldrotha, however
Because this is owner, and not controller, that means you can kill people off if you roll a 20 and can kill off the chosen Creature
With black not seeing much aggressive support in the MTGO Cubes I dont think well be seeing this in Vintage Cube, but its a very good fit for formats like the Arena Cubes
The Graven Lore is uncounterable in this circumstance, of course, but getting to leave up any of our two-mana permission for our opponents turn is real solid
And that puts them down 1:2 already, and of course you are in Blue, so you'll counter it
Coiling Rebirth Coiling Rebirth looks like a solid reanimation spell for decks interested in nonlegendary creatures with powerful enters abilities (looking at you, Archon of Cruelty!)