Thraben Doomsayer, Thornbite Staff, and Carrion Feeder

Prerequisites

• Thraben Doomsayer on the battlefield
• Thornbite Staff on the battlefield
• Carrion Feeder on the battlefield

Steps

1. Activate Thraben Doomsayer by tapping it, creating a 1/1 Human creature token
2. Activate Carrion Feeder by sacrificing the Human
3. When the Human dies, Thraben Doomsayer triggers, untapping Thraben Doomsayer
4. Resolve the Carrion Feeder ability, putting a +1/+1 counter on it
5. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite damage
• Infinite +1/+1 counters on Carrion Feeder