Pirate Ship, and Thornbite Staff

Prerequisites

• Pirate Ship on the battlefield
• Thornbite Staff on the battlefield
• You have a way to give Pirate Ship deathtouch
• Thornbite Staff attached to Pirate Ship
• Pirate Ship does not have summoning sickness

Steps

1. Give Pirate Ship deathtouch, if needed
2. Activate Pirate Ship by tapping it, dealing 1 damage to any creature an opponent controls, and destroying it due to Pirate Ship's deathtouch
3. When the creature dies, Pirate Ship triggers, untapping Pirate Ship
4. Repeat from step 2
5. If the effect giving Pirate Ship deathtouch is a static effect, you may repeat this whenever a creature enters the battlefield under an opponent's control

Results

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