Goblin Sharpshooter, and Godhead of Awe

Prerequisites

• Goblin Sharpshooter on the battlefield
• Godhead of Awe on the battlefield
• Goblin Sharpshooter does not have summoning sickness

Steps

1. Activate Goblin Sharpshooter by tapping it, dealing 1 damage to any creature an opponent controls
2. The creature dies as a state-based action due to having zero or less toughness
3. Goblin Sharpshooter triggers, untapping itself
4. Repeat
5. You may also repeat this loop whenever a creature enters the battlefield under an opponent's control

Results

• Destroy all creatures that enter the battlefield under an opponent's control
• Destroy all creatures your opponents control