Activate Tough Cookie's first ability by paying at most {1}{G}, causing Basalt Monolith to become a 4/4 artifact creature until end of turn.
Activate Basalt Monolith's first ability by tapping it, adding {C}{C}{C}.
activate Basalt Monolith's second ability by paying at most {2}, untapping it.
Repeat from step 2.

Infinite colorless mana

Basalt Monolith

Tough Cookie

Agatha of the Vile Cauldron

Animate Basalt Monolith using Tough Cookie.
Activate Basalt Monolith by tapping it, adding {C}{C}{C}.
Activate Voltaic Construct by paying {2}, untapping Basalt Monolith.
Repeat from step 2.

Infinite untap of artifact creatures you control

Voltaic Construct

Animate Spawning Pit using Tough Cookie.
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 ETB

Infinite sacrifice triggers

Infinite death triggers

Ashaya, Soul of the Wild

Blossoming Tortoise

Spawning Pit

Stridehangar Automaton

Animate Spawning Pit using Tough Cookie
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

Animate Solar Array, if needed.
Cast Pemmin's Aura 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 Pemmin's Aura 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

Pemmin's Aura

Activate Tough Cookie's first ability by paying {2}{G}, causing Maskwood Nexus to become a 4/4 artifact creature until end of turn.
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 creature tokens

Infinite mana creatures you control can produce

Infinite untap of all creatures

Intruder Alarm

Maskwood Nexus

Animate Candelabra using Tough Cookie.
Cast Sakashima the Impostor by paying {2}{U}{U}. Choose to have it enter the battlefield as a copy of Candelabra of Tawnos that is still named Sakashima the Impostor and legendary.
Activate Uthros, Titanic Godcore by paying {U} and tapping it, adding at least {U}{U}{U}{U}{U}
Activate Sakashima the Impostor by paying {2} and tapping it, untapping Minamo and Uthros, Titanic Godcore.
Activate Minamo's second ability by paying {U}, untapping Sakashima the Impostor.
Repeat from step 3.

Infinite mana lands you control can produce

Infinite blue mana

Infinite untap of lands you control

Candelabra of Tawnos

Sakashima the Impostor

Minamo, School at Water's Edge

Uthros, Titanic Godcore

Cast Exchange of Words by paying {1}{U}{U}.
When Exhcange of Words enters the battlefield, it triggers, switching the text boxes of Soldevi Simulacrum and Tough Cookie.
Activate Tough Cookie by paying {0}, giving itself +1/+0 until end of turn.
Repeat step 3.

Infinitely powerful Tough Cookie until end of turn

Sam, Loyal Attendant

Exchange of Words

Soldevi Simulacrum

Cast Exchange of Words by paying {1}{U}{U}.
When Exhcange of Words enters the battlefield, it triggers, switching the text boxes of Farrelite Priest and Tough Cookie.
Activate Tough Cookie by paying {0}, adding {W}.
Repeat step 3.

Infinite white mana

Farrelite Priest

Cast Exchange of Words by paying {1}{U}{U}.
When Exhcange of Words enters the battlefield, it triggers, switching the text boxes of Initiates of the Ebon Hand and Tough Cookie.
Activate Tough Cookie by paying {0}, adding {B}.
Repeat step 3.

Infinite black mana

Initiates of the Ebon Hand

Cast Exchange of Words by paying {1}{U}{U}.
When Exhcange of Words enters the battlefield, it triggers, switching the text boxes of Bog Initiate and Tough Cookie.
Activate Tough Cookie by paying {0}, adding {B}.
Repeat step 3.

Combos with "Tough Cookie"