Cast Rot Hulk by paying {5}{B}{B}.
When Rot Hulk enters, it and Necroduality trigger.
Holding priority, activate Carrion Feeder by sacrificing Rot Hulk.
Resolve the Rot Hulk trigger, failing to return anything to the battlefield.
Resolve the Necroduality trigger, creating a token copy of Rot Hulk.
When the token Rot Hulk enters, it triggers, returning Rot Hulk from your graveyard to the battlefield.
Repeat from step 2.

Infinite +1/+1 counters on a creature

Infinite creature tokens

Infinite death triggers

Infinite creature ETB

Infinite creature LTB

Infinite creature sacrifice triggers

Return some creature cards from your graveyard to the battlefield

Necroduality

Rot Hulk

Carrion Feeder

Cast Rot Hulk by paying {5}{B}{B}.
When Rot Hulk enters, it and Necroduality trigger.
Resolve the Rot Hulk trigger, returning Fleshbag Marauder from your graveyard to the battlefield.
When Fleshbag Marauder enters, it and Necroduality trigger.
Resolve the Fleshbag Marauder trigger, sacrificing it and causing each opponent to sacrifice a creature.
Resolve the Necroduality trigger, creating a token copy of Fleshbag Marauder.
When the token Fleshbag Marauder enters, it triggers, sacrificing Rot Hulk and causing each opponent to sacrifice a creature.
Resolve the Necroduality trigger from step 2, creating a token copy of Rot Hulk.
When the token Rot Hulk enters, it triggers, returning Rot Hulk from your graveyard to the battlefield.
Repeat from step 2.

Each opponent sacrifices all creatures they control

Fleshbag Marauder

Cast Rot Hulk by paying {5}{B}{B}.
When Rot Hulk enters, it and Necroduality trigger.
Resolve the Rot Hulk trigger, returning Sidisi from your graveyard to the battlefield.
When Sidisi enters, it and Necroduality trigger.
Resolve the Sidisi trigger, sacrificing it.
When Sidisi exploits itself, its third ability triggers, causing you to search your library for a card and putting it into your hand.
Resolve the Necroduality trigger, creating a token copy of Sidisi.
When the token Sidisi enters, it triggers, sacrificing Rot Hulk.
When Sidisi exploits Rot Hulk, its third ability triggers, causing you to search your library for a card and putting it into your hand.
Resolve the Necroduality trigger from step 2, creating a token copy of Rot Hulk.
When the token Rot Hulk enters, it triggers, returning Rot Hulk from your graveyard to the battlefield.
Repeat from step 2.

Infinite card draw

Sidisi, Undead Vizier

Cast Rot Hulk by paying {5}{B}{B}.
When Rot Hulk enters, it and Necroduality trigger.
Resolve the Rot Hulk trigger, returning Ravenous Rotbelly from your graveyard to the battlefield.
When Ravenous Rotbelly enters, it and Necroduality trigger.
Resolve the Ravenous Rotbelly trigger, sacrificing it.
When you sacrifice Ravenous Rotbelly, it triggers, causing each opponent to sacrifice a creature.
Resolve the Necroduality trigger, creating a token copy of Ravenous Rotbelly.
When the token Ravenous Rotbelly enters, it triggers, sacrificing Rot Hulk.
When you sacrifice Rot Hulk, it triggers, causing each opponent to sacrifice a creature.
Resolve the Necroduality trigger from step 2, creating a token copy of Rot Hulk.
When the token Rot Hulk enters, it triggers, returning Rot Hulk from your graveyard to the battlefield.
Repeat from step 2.

Ravenous Rotbelly

Cast Rot Hulk by paying {5}{B}{B}.
When Rot Hulk enters, it and Necroduality trigger.
Resolve the Rot Hulk trigger, returning Repository Skaab from your graveyard to the battlefield.
When Repository Skaab enters, it and Necroduality trigger.
Resolve the Repository Skaab trigger, sacrificing it.
When Repository Skaab is exploited, Repository Skaab triggers, causing you to return an instant or sorcery from your graveyard to your hand.
Resolve the Necroduality trigger, creating a token copy of Repository Skaab.
When the token Repository Skaab enters, it triggers, sacrificing Rot Hulk.
When Rot Hulk is exploited, Repository Skaab triggers, causing you to return an instant or sorcery from your graveyard to your hand.
Resolve the Necroduality trigger from step 2, creating a token copy of Rot Hulk.
When the token Rot Hulk enters, it triggers, returning Rot Hulk from your graveyard to the battlefield.
Repeat from step 2.

Return all instant and sorcery cards from your graveyard to your hand

Repository Skaab

Cast Rot Hulk by paying {5}{B}{B}.
When Rot Hulk enters, it and Necroduality trigger.
Resolve the Rot Hulk trigger, returning Rot-Tide Gargantua from your graveyard to the battlefield.
When Rot-Tide Gargantua enters, it and Necroduality trigger.
Resolve the Rot-Tide Gargantua trigger, sacrificing it.
When Rot-Tide Gargantua is exploited, Rot-Tide Gargantua triggers, causing each opponent to sacrifice a creature.
Resolve the Necroduality trigger, creating a token copy of Rot-Tide Gargantua.
When the token Rot-Tide Gargantua enters, it triggers, sacrificing Rot Hulk.
When Rot Hulk is exploited, Rot-Tide Gargantua triggers, causing each opponent to sacrifice a creature.
Resolve the Necroduality trigger from step 2, creating a token copy of Rot Hulk.
When the token Rot Hulk enters, it triggers, returning Rot Hulk from your graveyard to the battlefield.
Repeat from step 2.

Rot-Tide Gargantua

Cast Rot Hulk by paying {5}{B}{B}.
When Rot Hulk enters, it and Necroduality trigger.
Resolve the Rot Hulk trigger, returning Accursed Centaur from your graveyard to the battlefield.
When Accursed Centaur enters, it and Necroduality trigger.
Resolve the Accursed Centaur trigger, sacrificing it.
Resolve the Necroduality trigger, creating a token copy of Accursed Centaur.
When the token Accursed Centaur enters, it triggers, sacrificing Rot Hulk.
Resolve the Necroduality trigger from step 2, creating a token copy of Rot Hulk.
When the token Rot Hulk enters, it triggers, returning Rot Hulk from your graveyard to the battlefield.
Repeat from step 2.

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