Activate Recurring Nightmare by sacrificing a creature and returning it from the battlefield to your hand, returning Myr Battlesphere from your graveyard to the battlefield.
When Myr Battlesphere enters the battlefield, it triggers, creating four 1/1 Myr artifact creature tokens.
Activate Phyrexian Altar three times by sacrificing Myr Battlesphere and two Myrs, adding {2}{B}.
Cast Recurring Nightmare by paying {2}{B}.
Repeat.

Infinite colored mana

Infinite creature tokens

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Infinite storm count

Recurring Nightmare

Phyrexian Altar

Myr Battlesphere

Activate Recurring Nightmare by sacrificing a creature and returning it from the battlefield to your hand, returning Hornet Queen from your graveyard to the battlefield.
When Hornet Queen enters the battlefield, it triggers, creating four 1/1 Insect creature tokens.
Activate Phyrexian Altar three times by sacrificing Hornet Queen and two Insects, adding {2}{B}.
Cast Recurring Nightmare by paying {2}{B}.
Repeat.

Hornet Queen

Activate Recurring Nightmare by sacrificing a creature and returning it from the battlefield to your hand, returning Deep Forest Hermit from your graveyard to the battlefield.
When Deep Forest Hermit enters the battlefield, it triggers, creating four 1/1 Squirrel creature tokens.
Activate Phyrexian Altar three times by sacrificing Deep Forest Hermit and two Squirrels, adding {2}{B}.
Cast Recurring Nightmare by paying {2}{B}.
Repeat.

Deep Forest Hermit

Activate Recurring Nightmare by sacrificing a creature and returning it from the battlefield to your hand, returning Deranged Hermit from your graveyard to the battlefield.
When Deranged Hermit enters the battlefield, it triggers, creating four 1/1 Squirrel creature tokens.
Activate Phyrexian Altar three times by sacrificing Deranged Hermit and two Squirrels, adding {2}{B}.
Cast Recurring Nightmare by paying {2}{B}.
Repeat.

Deranged Hermit

Cast Dockside Extortionist by paying {1}{R}.
Dockside Extortionist enters the battlefield, creating at least six Treasure tokens.
Activate Recurring Nightmare by sacrificing Dockside Extortionist and returning itself to hand, return Mayhem Devil to the battlefield.
Activate five Treasure tokens by tapping and sacrificing those, adding {4}{B}{B}.
Mayhem Devil triggers six times each.
Resolve the first Mayhem Devil trigger, dealing 1 damage to any target.
Repeat step 6 for each remaining Mayhem Devil trigger.
Cast Recurring Nightmare by paying {2}{B}.
Activate Recurring Nightmare by sacrificing Mayhem Devil.
Mayhem Devil trigger, dealing 1 damage to any target.
Resolve the Recurring Nightmare by returning itself to hand, return Dockside Extortionist to the battlefield.
Repeat from step 2.

Combos with "Recurring Nightmare"