Activate Improvised Arsenal by paying {5}, creating a token copy of it.
Chishiro 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.

Infinite artifact ETB

Infinite artifact tokens

Infinite creature ETB

Infinite colored mana

Infinite colorless mana

Infinite creature tokens that are infinitely powerful

Infinitely powerful creatures you control

Improvised Arsenal

Mana Echoes

Chishiro, the Shattered Blade

Mycosynth Lattice

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.

Barret, Avalanche Leader

Infinite card draw

Infinite draw triggers

Chromatic Orrery

Activate Improvised Arsenal by paying {5}, creating a token copy of it.
Sokka and Suki 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.

Sokka and Suki

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