Sokka, Tenacious Tactician + Trusty Boomerang + Mana Echoes + Tannuk, Steadfast Second

Sokka, Tenacious Tactician

Trusty Boomerang

Mana Echoes

Tannuk, Steadfast Second

How it works

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