
Whenever Sephiroth enters or attacks, you may sacrifice another creature. If you do, draw a card.
Whenever another creature dies, target opponent loses 1 life and you gain 1 life. If this is the fourth time this ability has resolved this turn, transform Sephiroth.
Flying
Super Nova — As this creature transforms into Sephiroth, One-Winged Angel, you get an emblem with "Whenever a creature dies, target opponent loses 1 life and you gain 1 life."
Whenever Sephiroth attacks, you may sacrifice any number of other creatures. If you do, draw that many cards.
Sephiroth is a mono-black aristocrats engine: flood the board with cheap, expendable creatures, sacrifice them to draw cards off his attack/ETB triggers, and drain the table for life every time something dies. Hit four death triggers in a turn and he flips into One-Winged Angel, leaving behind an emblem that turns every future death into a permanent drain. You grind opponents out with incremental life loss while refilling your hand on the sacrifice engine.
Add free sacrifice outlets (Carrion Feeder, Viscera Seer, Ashnod's Altar) and persist/undying engines like Mikaeus, the Unhallowed plus Murderous Redcap or Carrion Feeder for infinite drain combos. Tighten the curve with cheap tutors (Demonic Tutor, Vampiric Tutor, Diabolic Intent) to assemble your engine faster, and run multiple drain payoffs (Zulaport Cutthroat, Bastion of Remembrance) so each death hits the whole table. Fast mana like Dark Ritual and a tuned removal package help you stabilize and flip Sephiroth ahead of schedule.
The most-played cards for this commander, built from aggregated deck data (the Mythic Graph). Build public decks to seed it.
→ Infinite LTB, Infinite ETB, Infinite sacrifice triggers
→ Infinite LTB, Infinite ETB, Infinite sacrifice triggers
→ Infinite LTB, Infinite ETB, Infinite sacrifice triggers
→ Infinite ETB, Infinite LTB, Infinite colored mana
→ Infinite LTB, Infinite ETB, Infinite colored mana
Combos via Commander Spellbook.
Same color identity (B), by popularity.