Cloudstone Curio + Xenagos, the Reveler + Domri, Anarch of Bolas

Cloudstone Curio

Xenagos, the Reveler

Domri, Anarch of Bolas

How it works

1. Activate Xenagos's first ability by putting a loyalty counter on it, adding at least 3.
2. Cast Domri by paying 1.
3. Domri enters the battlefield, triggering Cloudstone Curio, returning Xenagos from the battlefield to your hand.
4. Activate Domri's first ability by putting a loyalty counter on it, adding R/G.
5. Cast Xenagos by paying 2.
6. Xenagos enters the battlefield, triggering Cloudstone Curio, returning Domri from the battlefield to your hand.
7. Repeat.
8. Once you have infinite mana, you may instead activate Xenagos' second ability to get infinite creature tokens.