Trusty Boomerang + Mana Echoes + Hammer of Purphoros + Sokka and Suki

Trusty Boomerang

Mana Echoes

Hammer of Purphoros

Sokka and Suki

How it works

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

This clever loop relies on Sokka and Suki acting as a tireless engine, triggering a cascade every time Trusty Boomerang re-enters the battlefield. Thanks to Hammer of Purphoros granting haste to your team, the newly created 1/1 Ally token can immediately activate the boomerang attached to it via Sokka and Suki's auto-equip ability, tapping a creature and bouncing the equipment back to your hand. Replaying Trusty Boomerang then triggers Mana Echoes to flood your pool with colorless mana, scaling with the growing army of Allies you've generated along the way.