Grinning Ignus, Urza's Incubator, Signpost Scarecrow, and Heartstone

Prerequisites

• Grinning Ignus on the battlefield
• Urza's Incubator on the battlefield
• Signpost Scarecrow on the battlefield
• Heartstone on the battlefield
• available

Steps

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

Results

• Infinite ETB
• Infinite LTB
• Infinite storm count