Sneak Attack + Mardu Warshrieker + Cloudstone Curio + Crimson Kobolds

Sneak Attack

Mardu Warshrieker

Cloudstone Curio

Crimson Kobolds

How it works

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