Crystalline Crawler + Dancing from Dark to Dawn + Cloudstone Curio

Crystalline Crawler

Dancing from Dark to Dawn

Cloudstone Curio

How it works

1. Cast the nonartifact creature in your hand by paying its mana cost.
2. Dancing from Dark to Dawn's first ability triggers, putting a number of +1/+1 counters on Crystalline Crawler.
3. Resolve the creature spell. When it enters, Cloudstone Curio triggers, returning the other creature from the battlefield to your hand.
4. Activate Crystalline Crawler by removing a +1/+1 counter from it, adding one mana of any color.
5. Repeat step 4 until you run out of +1/+1 counters, or you have enough mana to cast the creature that was returned to your hand.
6. Repeat from step 1.