Cast Screams from Within by paying {1}{B}{B}, attaching it to another creature with toughness equal to 1.
The creature dies as a state-based action due to having zero toughness, triggering Warehouse Tabby and Screams from Within.
Resolve the Warehouse Tabby trigger, creating a 1/1 Rat creature token.
Resolve the Screams from Within trigger, returning it from your graveyard to the battlefield attached to the Rat.
Repeat from step 2.

Infinite death triggers

Infinite ETB

Infinite LTB

Screams from Within

Warehouse Tabby

Cast Screams from Within by paying {1}{B}{B}, attaching it to a creature with toughness equal to 1.
The creature dies as a state-based action due to having zero toughness, triggering Knight of Doves and Screams from Within.
Resolve the Knight of Doves trigger, creating a 1/1 Bird creature token.
Resolve the Screams from Within trigger, returning it from your graveyard to the battlefield attached to the Bird.
Repeat from step 2.

Knight of Doves

Activate Altar of Dementia by sacrificing the creature that has Screams from Within attached.
When the creature dies, Screams from Within triggers, returning it from your graveyard to the battlefield attached to another creature you control.
Teval triggers, creating a creature token.
Resolve the Altar of Dementia ability.
Repeat.

Infinite sacrifice triggers

Infinite mill

Infinite self-mill

Altar of Dementia

Teval, the Balanced Scale

Cast Screams from Within by paying {1}{B}{B}, attaching it to a creature with toughness equal to 1.
The creature dies as a state-based action due to having 0 toughness.
Gremlin Tamer and Screams from Within trigger.
Resolve the Gremlin Tamer trigger, creating a 1/1 Gremlin creature token.
Resolve the Screams from Within trigger, returning it from your graveyard to the battlefield attached to the Gremlin.
Repeat from step 2.

Gremlin Tamer

Activate Viscera Seer by sacrificing enchanted creature.
Screams from Within triggers, returning it from the graveyard to the battlefield attaching to Ajani's Chosen.
Ajani's Chosen triggers, creating a 2/2 Cat token and attach Screams from Within to it.
Resolve the Viscera Seer's ability, scrying one.
Repeat.

Combos with "Screams from Within"