Activate Phyrexian Altar by sacrificing the creature that can be cast using one colored mana, adding one mana of any color.
When the creature dies, Mortuary and Remembrance trigger.
Resolve the Mortuary trigger, putting the creature from your graveyard on top of your library.
Resolve the Remembrance trigger, searching your library for the creature and putting it into your hand.
Cast the creature by paying its mana cost.
Repeat.

Infinite creature LTB

Infinite creature ETB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite storm count

Remembrance

Mortuary

Phyrexian Altar

Activate Ashnod's Altar by sacrificing Guan Yu, adding {C}{C}.
When Guan Yu dies, it, Deathrender and Remembrance trigger.
Resolve the Guan Yu trigger, causing you to shuffle it into your library from your graveyard.
Resolve the Remembrance trigger, causing you to search your library for Guan Yu and put it into your hand.
Resolve the Deathrender trigger, putting Guan Yu from your hand onto the battlefield, and attaching Deathrender to it.
Repeat.

Infinite colorless mana

Guan Yu, Sainted Warrior

Deathrender

Ashnod's Altar

Activate Altar of Dementia by sacrificing Arashin Sovereign.
When Arashin Sovereign dies, it, Deathrender and Remembrance trigger.
Resolve the Arashin Sovereign trigger, causing you to put it on top of your library from your graveyard.
Resolve the Remembrance trigger, causing you to search your library for Arashin Sovereign and put it into your hand.
Resolve the Deathrender trigger, putting Arashin Sovereign from your hand onto the battlefield, and attaching Deathrender to it.
Resolve the Altar of Dementia ability, causing target player to mill cards equal to Arashin Sovereign's power.
Repeat.

Infinite mill

Infinite self-mill

Arashin Sovereign

Altar of Dementia

Activate Viscera Seer by sacrificing Shield Sphere.
When Shield Sphere dies, Mortuary and Remembrance trigger.
Resolve the Mortuary trigger, putting Shield Sphere from your graveyard on top of your library.
Resolve the Remembrance trigger, searching your library for Shield Sphere and putting it into your hand.
Resolve the Viscera Seer ability, causing you to scry 1.
Cast Shield Sphere by paying {0}.
Repeat.

Infinite scry 1

Viscera Seer

Shield Sphere

Combos with "Remembrance"