Trusty Boomerang + Mana Echoes + The Fire Crystal + Sokka and Suki

Trusty Boomerang

Mana Echoes

The Fire Crystal

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 loop creates a self-sustaining engine by turning the constant recycling of Trusty Boomerang into an army of allies and endless colorless mana. Whenever Trusty Boomerang enters the battlefield, Sokka and Suki triggers to create a 1/1 Ally token, which in turn triggers Mana Echoes to generate scaling colorless mana based on your growing horde of shared-type creatures. Sokka and Suki's first ability seamlessly re-equips Trusty Boomerang back onto the newly created token, allowing you to immediately activate the equipment's ability to bounce it back to your hand for just {1}. While The Fire Crystal isn't strictly necessary for the core bounce loop to function, its presence on the battlefield grants your entire team haste and discounts your red spells, perfectly complementing the explosive nature of this artifact-heavy combination.