Trusty Boomerang + Mana Echoes + Chishiro, the Shattered Blade + Nahiri's Resolve

Trusty Boomerang

Mana Echoes

Chishiro, the Shattered Blade

Nahiri's Resolve

How it works

1. Cast Trusty Boomerang by paying 1.
2. When Trusty Boomerang enters, Chishiro's triggers, creating a 2/2 Spirit creature token.
3. When the Spirit enters, Mana Echoes triggers, adding C for each Spirit you control.
4. Activate Trusty Boomerang's equip ability by paying 1, attaching it to the Spirit token.
5. Activate the Spirit by paying 1 and tapping it, tapping a creature and returning Trusty Boomerang from the battlefield to your hand.
6. Repeat.

This loop relies on Chishiro, the Shattered Blade turning every deployment of Trusty Boomerang into a fresh Spirit creature token, which in turn fuels Mana Echoes to generate an escalating flood of colorless mana. You use that mana to continuously recast the Equipment and attach it to your newest token via its equip cost, feeding the loop infinitely. Meanwhile, Nahiri's Resolve passively grants your team haste and an extra layer of board presence, rounding out an engine that produces infinite artifact and creature triggers alongside endless tapped tokens.