Heartless Hidetsugu, Angrath's Marauders, and With Great Power...

Prerequisites

• Heartless Hidetsugu on the battlefield
• Angrath's Marauders on the battlefield
• With Great Power
• on the battlefield

Steps

1. Activate Heartless Hidetsugu by tapping it, dealing damage to each opponent equal to half their life total, rounded down, times 2, and dealing no damage to you due to With Great Power
2. Activate Heartless Hidetsugu by tapping it, causing it to deal damage to each player equal to half their life total, rounded down, then doubled
3. Each player who started with an even life ottal loses the game for having 0 or less life

Results

• Near-infinite damage
• Each opponent with an even life total loses the game