Animate Thran Dynamo using Living Brain.
Activate Thran Dynamo by tapping it, adding {C}{C}{C}
Activate Voltaic Construct by paying {2}, untapping Thran Dynamo.
Repeat from step 2.

Infinite colorless mana

Infinite untap of artifact creatures you control

Voltaic Construct

Living Brain, Mechanical Marvel

Thran Dynamo

Cause Basalt Monolith to become a creature using Living Brain.
Activate Basalt Monolith's first ability by tapping it, adding {C}{C}{C}.
Activate Basalt Monolith's last ability by paying {2}, untapping it.
Repeat from step 2.

Basalt Monolith

Heartstone

Animate Solar Array, if needed.
Cast Freed from the Real by paying its mana cost, attaching it to Solar Array.
Activate Solar Array by tapping it, adding {U} and causing the next artifact spell you cast this turn to have sunburst.
Activate Freed from the Real by paying {U}, untapping Solar Array.
Repeat from step 3 as desired.
Cast any artifact spell, triggering its sunburst ability an infinite number of times, either putting infinite +1/+1 counters on charge counters on the artifact.

Infinite +1/+1 counters on a creature

Infinite charge counters on artifacts you cast

Infinite +1/+1 counters on artifact creatures you cast

Solar Array

Freed from the Real

Animate Maskwood with Living Brain.
Activate any number of mana-producing creatures you control by tapping them, adding at least {3}.
Activate Maskwood Nexus by paying {3} and tapping it, creating a 2/2 Shapeshifter creature token.
When the Shapeshifter enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Repeat from step 2.
If creatures you control can tap to produce at least {4}, this combo nets infinite mana.

Infinite ETB

Infinite creature tokens

Infinite mana creatures you control can produce

Infinite untap of creatures

Intruder Alarm

Maskwood Nexus

Animate Spawning Pit using Living Brain.
Activate Spawning Pit's second ability by removing two charge counters from it, creating two creature tokens.
Activate Spawning Pit's first ability twice by sacrificing the creature tokens, putting two charge counters on it.
Repeat from step 2.

Infinite LTB

Infinite sacrifice triggers

Infinite death triggers

Ashaya, Soul of the Wild

Blossoming Tortoise

Spawning Pit

Parallel Lives

Animate Spawning Pit using Living Brain
Activate Spawning Pit's second ability by removing two charge counters from it due to Blossoming Tortoise, creating a 2/2 Spawn artifact creature token.
Activate Spawning Pit's first ability by sacrificing the Spawn, putting two charge counters on it.
Repeat from step 2.

Pir, Imaginative Rascal

Search Results