Goblin Sharpshooter, and Living Plane

Prerequisites

• Goblin Sharpshooter on the battlefield
• Living Plane on the battlefield
• Goblin Sharpshooter does not have summoning sickness

Steps

1. Activate Goblin Sharpshooter by tapping it, dealing 1 damage to any land an opponent controls
2. The land dies as a state-based action due to having zero or less toughness
3. Goblin Sharpshooter triggers, untapping itself
4. Repeat
5. You may also repeat this loop whenever a land enters the battlefield under an opponent's control

Results

• Destroy all lands opponents control
• Destroy all lands that enter the battlefield under an opponent's control