Incubation Druid, Cloudstone Curio, Rancor, and Nature's Chosen

Prerequisites

• Incubation Druid on the battlefield
• Cloudstone Curio on the battlefield
• Rancor in hand
• Nature's Chosen on the battlefield
• Nature's Chosen attached to Incubation Druid
• Incubation Druid has at least one +1/+1 counter on it
• You control a land that can tap to produce
• Incubation Druid does not have summoning sickness

Steps

1. Activate Incubation Druid by tapping it, adding
2. Activate Nature's Chosen by paying , untapping Incubation Druid
3. Cast Rancor by paying , attaching it to Incubation Druid
4. Rancor enters the battlefield, triggering Cloudstone Curio, returning Nature's Chosen from the battlefield to your hand
5. Cast Nature's Chosen by paying , attaching it to Incubation Druid
6. Nature's Chosen enters the battlefield, triggering Cloudstone Curio, returning Rancor from the battlefield to your hand
7. Repeat

Results

• Infinite mana lands you control can produce
• Infinite storm count