Kykar, Wind's Fury + Trusty Boomerang + Mana Echoes + Smellerbee, Rebel Fighter

Kykar, Wind's Fury

Trusty Boomerang

Mana Echoes

Smellerbee, Rebel Fighter

How it works

1. Cast Trusty Boomerang by paying 1.
2. Kykar triggers, creating a 1/1 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 token by paying 1 and tapping it, tapping a creature a returning Trusty Boomerang from the battlefield to your hand.
6. Repeat.

This delightful loop turns the humble equipment Trusty Boomerang into an infinite-value engine by continuously recasting it as a noncreature spell. Every time you cast it, Kykar, Wind's Fury rewards you with a Spirit token, whose entry triggers Mana Echoes to flood your pool with colorless mana—which can then be supplemented by Kykar's own ability to sacrifice spirits for red mana. Meanwhile, Smellerbee, Rebel Fighter stands ready on the field to grant haste and offer fierce card advantage if you ever choose to pivot your endless army toward the combat phase.