Before Vivi, it was Cori-Steel Cutter
I chose the morph route as it's a less explored space, and with Zimone ability to flip up some big monsters and not purely rely on your creature's ability, you can do some tricky shenanigans
A commander with affinity is already annoying because its hard to kill but extending that ability to your instants and sorceries makes you unmanageable
Im not going to take someones spellslinger license away because they run Archmage Emeritus over Cosmic Epiphany, but its worth acknowledging its not that big a departure from any other permanent-dependent deck
Ashiok wants lots of cards in exile to fuel its ultimate ability, and with draft decks being merely 40 cards, defeating the opponent with mill can be surprisingly easy
The original [casthaven]Karoo[/casthaven] lands and the Ravnica bouncelands, such as [casthaven]Simic Growth Chamber[/casthaven]