Sneak Attack + Burning-Tree Emissary + Cloudstone Curio + Crookshank Kobolds

Sneak Attack

Burning-Tree Emissary

Cloudstone Curio

Crookshank Kobolds

How it works

1. Activate Sneak Attack by paying , putting Burning-Tree Emissary onto the battlefield.
2. Burning-Tree Emissary and Cloudstone Curio each trigger.
3. Resolve the Burning-Tree Emissary trigger, adding .
4. Resolve the Cloudstone Curio trigger, returning Crookshank Kobolds to your hand.
5. Cast Crookshank Kobolds by paying 0.
6. Cloudstone Curio triggers, returning Burning-Tree Emissary to your hand.
7. Repeat.