Heartless Hidetsugu, Pariah's Shield, and City on Fire

Prerequisites

• Heartless Hidetsugu on the battlefield
• Pariah's Shield on the battlefield
• City on Fire on the battlefield

Steps

1. Activate Heartless Hidetsugu by tapping it, dealing damage to each opponent equal to 1
2. 5 times their life total, and dealing no damage to you due to Pariah's Shield

Results

• Each opponent loses the game
• Near-infinite damage