Fain, the Broker, Thornbite Staff, Pitiless Plunderer, and Carrion Feeder

Prerequisites

• Fain, the Broker on the battlefield
• Thornbite Staff on the battlefield
• Pitiless Plunderer on the battlefield
• Carrion Feeder on the battlefield
• Fain does not have summoning sickness
• You control at least one additional artifact

Steps

1. Activate Fain's third ability by tapping it and sacrificing another artifact, creating a 2/1 Inkling creature token
2. Activate Carrion Feeder by sacrificing the Inkling
3. When the Inkling dies, Fain and Pitiless Plunderer trigger
4. Resolve the Fain trigger, untapping it
5. Resolve the Pitiless Plunderer trigger, creating a Treasure token
6. Resolve the Carrion Feeder ability, putting a +1/+1 counter on it
7. Repeat

Results

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