Maha, Its Feathers Night, and Goblin Sharpshooter

Prerequisites

• Maha, Its Feathers Night on the battlefield
• Goblin Sharpshooter on the battlefield
• Goblin Sharpshooter does not have summoning sickness

Steps

1. Activate Goblin Sharpshooter by tapping it, dealing 1 damage to a creature an opponent controls
2. The creature dealt damage dies as a state based action due to having 0 or less toughness, triggering Goblin Sharpshooter, untapping Goblin Sharpshooter
3. Repeat as desired
4. 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 opponents control