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 creature ETB

Infinite creature LTB

Screams from Within

Warehouse Tabby

Activate Phyrexian Altar by sacrificing the creature with Rancor attached, adding {G}.
When Rancor leaves the battlefield, it and Warehouse Tabby trigger.
Resolve the Warehouse Tabby trigger, creating a 1/1 Rat creature token.
Resolve the Rancor trigger, returning it to your hand from your graveyard.
Cast Rancor by paying {G}, attaching it to the Rat token.
Repeat.

Infinite creature sacrifice triggers

Infinite storm count

Rancor

Phyrexian Altar

Activate Ashnod's Altar by sacrificing an additional creature, adding {C}{C}.
When the creature dies as an enchantment due to Enchanted Evening, Warehouse Tabby triggers, creating a 1/1 Rat creature token.
Repeat.

Infinite colorless mana

Enchanted Evening

Ashnod's Altar

Activate Phyrexian Altar by sacrificing an additional creature, adding one mana of any color.
When the creature dies as an enchantment due to Enchanted Evening, Warehouse Tabby triggers, creating a 1/1 Rat creature token.
Repeat.

Infinite colored mana

Activate Altar of Dementia by sacrificing an additional creature.
When the creature dies as an enchantment due to Enchanted Evening, Warehouse Tabby triggers, creating a 1/1 Rat creature token.
Resolve the Altar of Dementia ability, causing target player to mill cards equal to the sacrificed creature's power.
Repeat.

Infinite mill

Infinite self-mill

Altar of Dementia

Activate Viscera Seer by sacrificing an additional creature.
When the creature dies as an enchantment due to Enchanted Evening, Warehouse Tabby triggers, creating a 1/1 Rat creature token.
Resolve the Viscera Seer ability, causing you to scry 1.
Repeat.

Infinite scry 1

Viscera Seer

Activate Carrion Feeder by sacrificing an additional creature.
When the creature dies as an enchantment due to Enchanted Evening, Warehouse Tabby triggers, creating a 1/1 Rat creature token.
Resolve the Carrion Feeder ability, putting a +1/+1 counter on it.
Repeat.

Infinite +1/+1 counters on a creature

Carrion Feeder

Activate Woe Strider by sacrificing an additional creature.
When the creature dies as an enchantment due to Enchanted Evening, Warehouse Tabby triggers, creating a 1/1 Rat creature token.
Resolve the Woe Strider ability, causing you to scry 1.
Repeat.

Combos with "Warehouse Tabby"