Cloudstone Curio + Bard Class + Domri, Anarch of Bolas + Wrenn and Six

Cloudstone Curio

Bard Class

Domri, Anarch of Bolas

Wrenn and Six

How it works

1. Activate Domri's first ability by putting a loyalty counter on it, adding R/G.
2. Cast Wrenn and Six by paying 0.
3. Wrenn and Six enters the battlefield, triggering Cloudstone Curio, returning Domri from the battlefield to your hand.
4. Activate Wrenn and Six's second ability by removing a loyalty counter from it, dealing 1 damage to any target.
5. Cast Domri by paying 1.
6. Domri enters the battlefield, triggering Cloudstone Curio, returning Wrenn and Six from the battlefield to your hand.
7. Repeat.