Grinning Ignus, Cloud Key, Stonework Packbeast, and Heartstone

Prerequisites

• Grinning Ignus on the battlefield
• Cloud Key on the battlefield
• Stonework Packbeast on the battlefield
• Heartstone on the battlefield
• "Creature" chosen with Cloud Key
• available

Steps

1. Activate Grinning Ignus by paying and returning it to your hand, adding
2. Cast Grinning Ignus by paying
3. Activate Stonework Packbeast by paying , adding
4. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite storm count