Horobi, Death's Wail, Thornbite Staff, and Dauthi Trapper

Prerequisites

• Horobi, Death's Wail on the battlefield
• Thornbite Staff on the battlefield
• Dauthi Trapper on the battlefield
• Thornbite Staff attached to Dauthi Trapper
• Dauthi Trapper does not have summoning sickness

Steps

1. Activate Dauthi Trapper by tapping it, targeting any creature
2. Horobi triggers, destroying that creature
3. When the creature dies, Dauthi Trapper 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 any number of creatures opponents control