March of the Machines, Liquimetal Coating, and Dross Scorpion

Prerequisites

• March of the Machines on the battlefield
• Liquimetal Coating on the battlefield
• Dross Scorpion on the battlefield
• Liquimetal Coating does not have summoning sickness

Steps

1. Activate Liquimetal Coating by tapping it, turning an opponent's land into an artifact
2. The land becomes a 0/0 creature due to March of the Machines, and dies as a state-based action due to having zero or less toughness
3. Dross Scorpion triggers, untapping Liquimetal Coating
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