All Will Be One, and Soul-Scar Mage

Prerequisites

• All Will Be One on the battlefield
• Soul-Scar Mage on the battlefield
• You have a way to deal noncombat damage to a creature an opponent controls

Steps

1. Attempt to deal noncombat damage to a creature an opponent controls, instead putting that many -1/-1 counters on it due to Soul-Scar Mage
2. All Will Be One triggers, putting that many -1/-1 counters on a creature an opponent controls
3. Repeat step 2

Results

• Destroy any number of creatures opponents control
• Destroy any number of creatures opponents control whenever you put a counter on a permanent or player
• Infinite -1/-1 counters on creatures opponents control