Greven, Predator Captain, and Necropotence

Prerequisites

• Greven, Predator Captain on the battlefield
• Necropotence on the battlefield
• Greven does not have summoning sickness and cannot be blocked by an opponent
• Your life total is at least 17

Steps

1. Activate Necropotence by paying 1 life, exiling the top card of your library and giving Greven +1/+1 until end of turn due to its first ability
2. Repeat step 1 until Greven is a 21/21 creature
3. Deal combat damage to an opponent using Greven
4. The opponent loses the game due to being dealt 21 combat damage from your commander

Results

• Target opponent loses the game