Activate Improvised Arsenal by paying {4}{R}, creating two token copies of it due to Exalted Sunborn.
Activate Krark-Clan Ironworks twice by sacrificing the Improvised Arsenal tokens, adding {C}{C}{C}{C}.
Crime Novelist triggers twice, putting two +1/+1 counters on it and adding {R}{R}.
Repeat.

Infinite colorless mana

Infinite red mana

Infinite +1/+1 counters on a creature

Improvised Arsenal

Crime Novelist

Krark-Clan Ironworks

Exalted Sunborn

Activate Improvised Arsenal by paying {4}{R}, creating a token copy of it. It will enter as a 7/7 Dinosaur due to Displaced Dinosaurs.
When the Improvised Arsenal token enters, Mana Echoes triggers, adding {C} for each Dinosaur you control.
If needed, activate Crossroads Candleguide by paying {2}, adding {R}.
Repeat.

Infinite ETB

Infinite colored mana

Infinite creature tokens

Mana Echoes

Displaced Dinosaurs

Crossroads Candleguide

Activate Improvised Arsenal by paying {5}, creating a token copy of it. It will enter as a 7/7 Dinosaur due to Displaced Dinosaurs.
When the Improvised Arsenal token enters, Mana Echoes triggers, adding {C} for each Dinosaur you control.
Repeat.

Chromatic Orrery

Activate Improvised Arsenal by paying {4}{R}, creating a token copy of it.
Barret triggers, creating a creature token.
When the creature token enters, Mana Echoes triggers, adding {C} for each creature you control that shares a creature type with the creature token.
If needed, activate Stonework Packbeast by paying {2}, adding {R}.
Repeat.

Infinite creature tokens that are infinitely powerful

Infinitely powerful creatures you control

Stonework Packbeast

Barret, Avalanche Leader

Activate Improvised Arsenal by paying {5}, creating a token copy of it.
Barret triggers, creating a creature token.
When the creature token enters, Mana Echoes triggers, adding {C} for each creature you control that shares a creature type with the creature token.
Repeat.

Combos with "Improvised Arsenal"