Living Plane, and Massacre Wurm

Prerequisites

• Living Plane on the battlefield
• Massacre Wurm in hand
• available

Steps

1. Cast Massacre Wurm by paying
2. Massacre Wurm enters the battlefield, giving all opposing creatures -2/-2 until end of turn
3. Because Living Plane causes all lands to be 1/1 creatures, all of your opponent' lands die as a state-based action due to having zero or less toughness
4. Massacre Wurm's second ability triggers for each land that dies this way, causing each opponent to lose 2 life for each land that died under their control

Results

• Destroy all lands opponents control
• Near-infinite lifeloss