Crystalline Crawler, Dancing from Dark to Dawn, and Cloudstone Curio

Prerequisites

• Crystalline Crawler on the battlefield
• Dancing from Dark to Dawn on the battlefield
• Cloudstone Curio on the battlefield

Steps

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
4. When it enters, Cloudstone Curio triggers, returning the other creature from the battlefield to your hand
5. Activate Crystalline Crawler by removing a +1/+1 counter from it, adding one mana of any color
6. 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
7. Repeat from step 1

Results

• Infinite ETB
• Infinite LTB
• Infinite storm count