Quest for Pure Flame, Heartless Hidetsugu, and Glacial Chasm

Prerequisites

• Quest for Pure Flame on the battlefield
• Heartless Hidetsugu on the battlefield
• Glacial Chasm on the battlefield

Steps

1. Activate Quest for the Pure Flame by removing four quest counters from it and sacrificing it, doubling damage sources you control will deal this turn
2. Activate Heartless Hidetsugu by tapping it, causing it to deal lethal damage to each opponent with an even life total, nearly lethal damage to each opponent with an odd life total, and no damage to you due to Glacial Chasm

Results

• Each opponent with an even life total loses the game
• Near-infinite damage