Heartless Hidetsugu, and Archfiend of Despair

Prerequisites

• Heartless Hidetsugu on the battlefield
• Archfiend of Despair on the battlefield
• Each opponent has an even life total
• Heartless Hidetsugu does not have summoning sickness

Steps

1. Activate Heartless HIdetsugu by tapping it, dealing damage to each player equal to half their life total, rounded down
2. At the beginning of your end step, Archfiend of Despair triggers, causing each opponent to lose life equal to the life they lost this turn
3. Each opponent loses the game due to having 0 or less life

Results

• Each opponent loses the game
• Near-infinite damage to all players
• Near-infinite lifeloss