Alpharael, Stonechosen, and Archfiend of Despair

Prerequisites

• Alpharael, Stonechosen on the battlefield
• Archfiend of Despair on the battlefield

Steps

1. Declare Alpharael as an attacker, triggering its ability, causing the defending player to lose half their life total, rounded up
2. At the beginning of your end step, Archfiend of Despair triggers, causing the opponent to lose the remainder of their life total

Results

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