Activate Sidisi by tapping it and sacrificing the creature with mana value 0.
When the creature dies, Sidisi triggers, untapping Sidisi.
Resolve the Sidisi ability, returning the creature that creates creature token(s) on death from your graveyard to the battlefield.
Activate Viscera Seer by sacrificing the creature.
When the creature dies, it and Sidisi trigger.
Resolve the Sidisi trigger, untapping it.
Resolve the creature's trigger, creating at least one creature token.
Resolve the Viscera Seer ability.
Repeat.

Infinite LTB

Infinite ETB

Infinite sacrifice triggers

Infinite death triggers

Infinite scry 1

Creature with MV=1 and Creates Creature Token(s) on Death

Sidisi, Regent of the Mire

Thornbite Staff

Viscera Seer

Activate Sidisi by tapping it and sacrificing a nontoken creature with mana value 5.
When the creature dies, Sidisi triggers, untapping Sidisi.
Resolve the Sidisi ability, returning Sister Hospitaller from your graveyard to the battlefield.
When Sister Hospitaller enters the battlefield, it triggers, returning the creature with mana value 5 from your graveyard to the battlefield and causing you to gain 5 life.
Activate Umbral Collar Zealot by sacrificing Sister Hospitaller.
When Sister Hospitaller dies, Sidisi triggers, untapping Sidisi.
Resolve the Umbral Collar Zealot ability.
Repeat.

Infinite lifegain triggers

Infinite lifegain

Infinite surveil 1

Sister Hospitaller

Umbral Collar Zealot

Activate Sidisi by tapping it and sacrificing the creature with mana value 4.
When the creature dies, Sidisi triggers, untapping Sidisi.
Resolve the Sidisi ability, returning Karmic Guide from your graveyard to the battlefield.
When Karmic Guide enters the battlefield, it triggers, returning the creature with mana value 4 from your graveyard to the battlefield.
Activate Bartolomé del Presidio by sacrificing Karmic Guide.
When Karmic Guide dies, Sidisi triggers, untapping Sidisi.
Resolve the Bartolomé del Presidio ability.
Repeat.

Infinite +1/+1 counters on Bartolomé del Presidio

Karmic Guide

Bartolomé del Presidio

Activate Sidisi by tapping it and sacrificing Zealous Conscripts, returning Sister Hospitaller from your graveyard to the battlefield.
When Sister Hospitaller enters the battlefield, it triggers, returning Zealous Conscripts from your graveyard to the battlefield and causing you to gain 5 life.
When Zealous Conscripts enters the battlefield, it triggers, untapping Sidisi.
Activate Umbral Collar Zealot by sacrificing Sister Hospitaller.
Repeat.

Zealous Conscripts

Activate Sidisi by tapping it and sacrificing a nontoken Dragon with mana value 6.
When the creature dies, Sidisi triggers, untapping Sidisi.
Resolve the Sidisi ability, returning Bladewing from your graveyard to the battlefield.
When Bladewing enters the battlefield, it triggers, returning the Dragon with mana value 6 from your graveyard to the battlefield.
Activate Umbral Collar Zealot by sacrificing Bladewing.
When Bladewing dies, Sidisi triggers, untapping Sidisi.
Resolve the Umbral Collar Zealot ability.
Repeat.

Bladewing the Risen

Activate Sidisi by tapping it and sacrificing Sparring Mummy, returning Karmic Guide from your graveyard to the battlefield.
When Karmic Guide enters the battlefield, it triggers, returning Sparring Mummy from your graveyard to the battlefield.
When Sparring Mummy enters the battlefield, it triggers, untapping Sidisi.
Activate Umbral Collar Zealot by sacrificing Karmic Guide.
Repeat.

Combos with "Sidisi, Regent of the Mire"