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 Urn of Godfire by paying {2}, adding {R}.
Repeat.

Infinite artifact ETB

Infinite artifact tokens

Infinite creature ETB

Infinite colored mana

Infinite colorless mana

Infinite creature tokens

Improvised Arsenal

Mana Echoes

Displaced Dinosaurs

Urn of Godfire

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.

Crossroads Candleguide

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 Energy Refractor by paying {2}, adding {R}.
Repeat.

Energy Refractor

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 Prismite by paying {2}, adding {R}.
Repeat.

Prismite

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 Signpost Scarecrow by paying {2}, adding {R}.
Repeat.

Signpost Scarecrow

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 Gemstone Array's first ability by paying {2}, putting a charge counter on it. Then, activate Gemstone Array's second ability by removing a charge counter from it, adding {R}.
Repeat.

Infinite charge counters on a permanent

Gemstone Array

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 Stonework Packbeast by paying {2}, adding {R}.
Repeat.

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