Overkill, and Jaws of Defeat

Prerequisites

• Overkill in hand
• Jaws of Defeat on the battlefield
• available

Steps

1. Cause any creature to enter the battlefield under your control, triggering Jaws of Defeat
2. Holding priority, cast Overkill by paying , giving the creature that entered -0/-9999 until end of turn
3. The creature dies as a state-based action due to having less than 0 toughness
4. Resolve the Jaws of Defeat trigger, causing target opponent to lose life equal to the difference between the creature's power and toughness, using its last known information

Results

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