Shard of the Nightbringer, and Archfiend of Despair

Prerequisites

• Shard of the Nightbringer in hand
• Archfiend of Despair on the battlefield
• available

Steps

1. Cast Shard of the Nightbringer by paying
2. Shard of the Nightbringer triggers, causing an opponent to lose half their life total, rounded up, and you to gain life equal to the life lost this way
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 targeted in step 2 loses the game due to having zero or less life

Results

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