From there, you can start dropping Tron staples like Karn Liberated and Ugin, the Spirit Dragon without compromising your mana base
Maybe, well see Teferi will return to form on Innistrad
I could see myself playing this not only in Valgavoth, but potentially in other decks like Hofri Reanimator
Doom Whisperer speeds up graveyard setup, and Children of Korlis unlocks explosive turns
Zof Consumption / Zof Bloodbog Zof Consumption is something that you can play in a black life gain / life drain EDH deck replacing a Swamp, or in decks that care about your opponents losing life like a Rakdos, Lord of Riots EDH deck
Still, since those kinds of strategies have always been fringe at best, Im wondering whether Sephiroth might finally push them into real viability or if its just another intriguing piece of an unsolved puzzle