Cloudstone Curio + Crimson Kobolds + Crookshank Kobolds

Cloudstone Curio

Crimson Kobolds

Crookshank Kobolds

How it works

1. Cast Crookshank Kobolds by paying 0.
2. When Crookshank Kobolds enters. Cloudstone Curio triggers, returning Crimson Kobolds from the battlefield to your hand.
3. Cast Crimson Kobolds by paying 0.
4. When Crimson Kobolds enters, Cloudstone Curio triggers, returning Crookshank Kobolds from the battlefield to your hand.
5. Repeat.