Barbed Servitor, and Volcano Hellion

Prerequisites

• Barbed Servitor on the battlefield
• Volcano Hellion in hand
• available

Steps

1. Cast Volcano Hellion by paying
2. When Volcano Hellion enters the battlefield, it triggers, dealing an amount of damage to you and Barbed Servitor equal to an opponent's life total
3. Barbed Servitor's third ability triggers, causing the opponent to lose that much life
4. The opponent loses the game due to having 0 life

Results

• Near-infinite lifeloss for target opponent
• Target opponent loses the game