Thornbite Staff, Viridian Longbow, and Vorpal Sword

Prerequisites

• Thornbite Staff on the battlefield
• Viridian Longbow on the battlefield
• Vorpal Sword on the battlefield
• Viridian Longbow and Thornbite Staff attached to a creature with deathtouch
• That creature does not have summoning sickness
• All Equipments and/or Auras attached to the same creature
• That creature does not have summoning sickness

Steps

1. Activate the creature's ability from Viridian Longbow by tapping it, dealing 1 damage to any target creature an opponent controls and destroying that target due to deathtouch
2. When that target dies, the creature's ability from Thornbite Staff triggers, untapping itself
3. Repeat
4. You may also repeat this loop whenever a creature enters the battlefield under an opponent's control
5. Activate the creature by tapping it, dealing damage to an opponent's creature
6. The opponent's creature dies due to deathtouch, triggering the second ability granted by Thornbite Staff, untapping your creature
7. Repeat until all opponents' creatures die
8. Repeat each time a creature enters the battlefield under an opponent's control

Results

• Destroy all creatures opponents control
• Destroy all creatures opponents control whenever a creature enters the battlefield