Nevinyrral, Urborg Tyrant, Rooftop Storm, and Cloudstone Curio

Prerequisites

• Nevinyrral, Urborg Tyrant in hand or in the command zone
• Rooftop Storm on the battlefield
• Cloudstone Curio on the battlefield
• At least one creature has died this turn
• You have enough mana to pay for commander tax, if applicable

Steps

1. Cast Nevinyrral either from your hand or the command zone by paying plus commander tax, if applicable
2. Nevinyrral enters the battlefield, triggering itself and Cloudstone Curio
3. Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand from the battlefield
4. Resolve the Nevinyrral trigger, creating a tapped 2/2 Zombie creature token for each creature that has died this turn
5. Each Zombie enters the battlefield, triggering Cloudstone Curio that many times
6. Resolve the first Cloudstone Curio trigger, returning Nevinyrral to your hand from the battlefield
7. Resolve each remaining Cloudstone Curio trigger, choosing to return nothing to your hand from the battlefield
8. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite storm count
• Infinite tapped creature tokens