Heartless Hidetsugu, and Phyresis

Prerequisites

• Heartless Hidetsugu on the battlefield
• Phyresis on the battlefield

Steps

1. Activate Heartless Hidetsugu by tapping it, causing each player to get a number of poison counters equal to half their life total, rounded down
2. Each opponent loses the game due to having ten or more poison counters

Results

• Each opponent loses the game