Trusty Boomerang + Mana Echoes + Samut, Voice of Dissent + Barret, Avalanche Leader

Trusty Boomerang

Mana Echoes

Samut, Voice of Dissent

Barret, Avalanche Leader

How it works

1. Cast Trusty Boomerang by paying 1.
2. When Trusty Boomerang enters, Barret'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.