Monk Gyatso + Genesis Chamber + Ashnod's Altar + Umbral Mantle

Monk Gyatso

Genesis Chamber

Ashnod's Altar

Umbral Mantle

How it works

1. Activate Umbral Mantle by paying 0, targeting another nontoken creature you control.
2. Monk Gyatso triggers, airbending the creature.
3. Cast the creature from exile by paying 2.
4. When the creature enters, Genesis Chamber triggers, creating a 1/1 Myr artifact creature token.
5. Activate Ashnod's Altar by sacrificing the Myr, adding CC.
6. Repeat.