When an opponent controls a nontoken creature, activate Viscera Seer by sacrificing another creature.
When the creature dies, The Serpent Society triggers, causing each opponent to sacrifice a creature.
When the opposing creature(s) die, Overseer of the Damned triggers that many times, creating that many tapped 2/2 Zombie creature tokens that will have deathtouch due to Archetype of Finality.
Resolve the Viscera Seer ability.
Repeat as needed.

Each opponent sacrifices all nontoken creatures they control

Each opponent sacrifices any nontoken creature that enters under their control

Lock

The Serpent Society

Overseer of the Damned

Archetype of Finality

Viscera Seer

Activate Ashnod's Altar by sacrificing Roadkill Rodney, adding {C}{C}.
When Roadkill Rodney dies, The Serpent Society triggers, causing each opponent to sacrifice a nontoken creature they control.
When a creature dies this way, Glissa triggers, returning Roadkill Rodney from your graveyard to your hand.
Cast Roadkill Rodney by paying {2}.
Repeat as able.

Each opponent sacrifices all nontoken creatures they control during each of your turns

Glissa, the Traitor

Roadkill Rodney

Ashnod's Altar

Activate Phyrexian Altar by sacrificing Hullcarver, adding {B}.
When Hullcarver dies, The Serpent Society triggers, causing each opponent to sacrifice a nontoken creature they control.
When a creature dies this way, Glissa triggers, returning Hullcarver from your graveyard to your hand.
Cast Hullcarver by paying {B}.
Repeat as able.

Phyrexian Altar

Hullcarver

Activate Krark-Clan Ironworks by sacrificing Super-Adaptoid, adding {C}{C}.
When Super-Adaptoid dies, The Serpent Society triggers, causing each opponent to sacrifice a nontoken creature they control.
When a creature dies this way, Glissa triggers, returning Super-Adaptoid from your graveyard to your hand.
Cast Super-Adaptoid by paying {2}.
When Super-Adaptoid enters, it triggers, choosing Glissa and giving Super-Adaptoid deathtouch and first strike.
Repeat as able.

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