Monk Gyatso + Soltari Guerrillas + Heartless Summoning

Monk Gyatso

Soltari Guerrillas

Heartless Summoning

How it works

1. Activate Soltari Guerrillas by paying 0, targeting itself.
2. Monk Gyatso triggers, airbending Soltari Guerrillas.
3. The Soltari Guerrillas ability fizzles due to no longer having a legal target.
4. Cast Soltari Guerrillas from exile by paying 0 due to Heartless Summoning.
5. Repeat.