Urborg, Tomb of Yawgmoth, Kormus Bell, Viridian Longbow, and Thornbite Staff

Prerequisites

• Urborg, Tomb of Yawgmoth on the battlefield
• Kormus Bell on the battlefield
• Viridian Longbow on the battlefield
• Thornbite Staff on the battlefield
• Viridian Longbow and Thornbite Staff attached to the same creature you control without summoning sickness

Steps

1. Whenever a land enters the battlefield, it enters as a 1/1 creature due to Urborg and Kormus Bell
2. Activate the creature with Viridian Longbow and Thornbite Staff attached by tapping it, dealing 1 damage to the land
3. The land dies as a state-based action due to having zero toughness
4. The creature triggers, untapping itself
5. Repeat as desired for each land an opponent controls, and whenever a land enters the battlefield under an opponent's control

Results

• Destroy all lands opponents control
• Destroy any land that enters the battlefield under an opponent's control