Trusty Boomerang + Mana Echoes + Chishiro, the Shattered Blade + Yarus, Roar of the Old Gods

Trusty Boomerang

Mana Echoes

Chishiro, the Shattered Blade

Yarus, Roar of the Old Gods

How it works

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

This looping engine uses Chishiro, the Shattered Blade to continuously flood the board with Spirit tokens whenever you cast and replay Trusty Boomerang. As those tokens enter, Mana Echoes scales your colorless mana generation exponentially with your growing army, fully funding the repeated casting and equipping costs. Trusty Boomerang acts as both the recursive trigger and the tap outlet, while Yarus, Roar of the Old Gods quietly hangs back to grant your squad haste and keep your options open should you pivot your strategy.