Blessed Sanctuary + Cloudstone Curio + Crimson Kobolds

Blessed Sanctuary

Cloudstone Curio

Crimson Kobolds

How it works

1. Cast Crimson Kobolds by paying 0.
2. Crimson Kobolds enters the battlefield, triggering Cloudstone Curio and Blessed Sanctuary.
3. Resolve the Cloudstone Curio trigger, returning nothing from the battlefield to your hand.
4. Resolve the Blessed Sanctuary, creating a 2/2 Unicron creature token.
5. The Unicorn enters the battlefield, triggering Cloudstone Curio, returning Crimson Kobolds from the battlefield to your hand.
6. Repeat.