Magus of the Moat, and Mystic Decree

Prerequisites

• Magus of the Moat on the battlefield
• Mystic Decree on the battlefield

Steps

1. All creatures lose flying and Islandwalk
2. Magus of the Moat prevents things without flying from attacking
3. Creatures can not fulfill the conditions nessasary to attack

Results

• Lock in which no creatures can attack