Morophon, the Boundless + Cloudstone Curio + Beastcaller Savant + Kobolds of Kher Keep

Morophon, the Boundless

Cloudstone Curio

Beastcaller Savant

Kobolds of Kher Keep

How it works

1. Activate Beastcaller Savant by tapping it, adding that can only be spent to cast a creature spell.
2. Cast Kobolds of Kher Keep by paying 0.
3. When Kobolds of Kher Keep enters the battlefield, Cloudstone Curio triggers, returning Beastcaller Savant to your hand from the battlefield.
4. Cast Beastcaller Savant by paying 1 due to Morophon.
5. When Beastcaller Savant enters the battlefield, Cloudstone Curio triggers, returning Kobolds of Kher Keep to your hand from the battlefield.
6. Repeat.