Grievous Wound, and Archfiend of Despair

Prerequisites

• Grievous Wound on the battlefield
• Archfiend of Despair on the battlefield
• You have a way to deal damage to the opponent that has Grievous Wound attached to them

Steps

1. Deal damage to the opponent that has Grievous Wound attached to them
2. Grievous Wound triggers, causing the opponent to lose half their life total, rounded up
3. 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
4. The opponent with Grievous Wound attached loses the game due to having 0 or less life

Results

• Target opponent loses the game
• Infinite lifeloss for target opponent