Cast Underworld Hermit by paying {4}{B}{B}.
When Underworld Hermit enters the battlefield, it and Cloudstone Curio trigger.
Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand from the battlefield.
Resolve the Underworld Hermit trigger, creating a number of 1/1 Squirrel creature tokens equal to your devotion to black.
When the Squirrels enter the battlefield, Cloudstone Curio triggers that many times.
Resolve the first Cloudstone Curio trigger, returning Underworld Hermit to your hand from the battlefield.
Resolve all remaining Cloudstone Curio triggers, choosing to return nothing to your hand from the battlefield.
Activate Phyrexian Altar six times by sacrificing six Squirrels, adding {4}{B}{B}.
Repeat.
If your devotion to black excluding Underworld Hermit is at least five, this combo will net infinite colored mana.

Infinite colored mana

Infinite creature tokens

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Infinite storm count

Cloudstone Curio

Phyrexian Altar

Underworld Hermit

During your upkeep, activate Necrotic Ooze using Whisper's ability by tapping it and sacrificing two other creatures, returning Underworld Hermit from your graveyard to the battlefield.
When Underworld Hermit enters the battlefield, it triggers, creating at least four 1/1 Squirrel creature tokens.
Activate Necrotic Ooze using Black Carriage's ability by sacrificing Underworld Hermit, untapping Necrotic Ooze.
Repeat.

Return all creature cards from your graveyard to the battlefield

Whisper, Blood Liturgist

Necrotic Ooze

Black Carriage

Cast Underworld Hermit by paying {4}{B}{B}.
Underworld Hermit enters the battlefield, creating at least six 1/1 Squirrel creature tokens.
Activate Phyrexian Altar by sacrificing Underworld Hermit, adding {B}.
Underworld Hermit dies, triggering Enduring Renewal, returning Underworld Hermit from your graveyard to your hand.
Activate Phyrexian Altar five times by sacrificing five Squirrels, adding {4}{B}.
Repeat.

Enduring Renewal

At the beginning of your combat phase, Helm of the Host triggers, creating at least one token copy of Underworld Hermit with haste.
When the Underworld Hermit token enters the battlefield, it triggers, creating at least four 1/1 Squirrel creature tokens.
Activate Time Sieve by tapping it, sacrificing the Underworld Hermit token and the Squirrel tokens, causing you to take an extra turn after this one.
Repeat each turn.

Infinite turns

Time Sieve

Mycosynth Lattice

Helm of the Host

Activate Akul the Unrepentant by sacrificing three creatures.
Ashnod the Uncaring triggers, copying Akul the Unrepentant's ability.
Resolve the copy of Akul the Unrepentant's ability, putting Underworld Hermit from your hand onto the battlefield.
When Underworld Hermit enters the battlefield, it and Cloudstone Curio trigger.
Resolve the Underworld Hermit trigger, creating a number of 1/1 Squirrel creature tokens equal to your devotion to black.
When the Squirrels enter the battlefield, Cloudstone Curio triggers that many times, returning nothing to your hand from the battlefield.
Resolve the Cloudstone Curio trigger from step 4, returning Akul the Unrepentant from the battlefield to your hand.
Resolve Akul the Unrepentant's ability from step 1, putting it onto the battlefield from your hand.
When Akul the Unrepentant enters the battlefield, Cloudstone Curio triggers, returning Underworld Hermit from the battlefield to your hand.
Repeat.

Ashnod the Uncaring

Akul the Unrepentant

At the beginning of your combat phase, Rionya triggers, creating at least one token copy of Underworld Hermit with haste.
When the Underworld Hermit token enters the battlefield, it triggers, creating at least four 1/1 Squirrel creature tokens.
Activate Time Sieve by tapping it, sacrificing the Underworld Hermit token and the Squirrel tokens, causing you to take an extra turn after this one.
Repeat each turn.

Encroaching Mycosynth

Rionya, Fire Dancer

Declare Delina as an attacker.
Delina triggers, creating at least one token copy of Underworld Hermit with haste.
When the Underworld Hermit token enters the battlefield, it triggers, creating at least four 1/1 Squirrel creature tokens.
Activate Time Sieve by tapping it, sacrificing the Underworld Hermit token and the Squirrel tokens, causing you to take an extra turn after this one.
Repeat each turn.

Delina, Wild Mage

Activate Kiki-Jiki by tapping it, creating a token copy of Underworld Hermit with haste.
When the Underworld Hermit token enters the battlefield, it triggers, creating at least four 1/1 Squirrel creature tokens.
Activate Time Sieve by tapping it, sacrificing the Underworld Hermit token and the Squirrel tokens, causing you to take an extra turn after this one.
Repeat each turn.

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