Adarkar Valkyrie, Thornbite Staff, and Carrion Feeder

Prerequisites

• Adarkar Valkyrie on the battlefield
• Thornbite Staff on the battlefield
• Carrion Feeder on the battlefield
• Adarkar Valkyrie does not have summoning sickness

Steps

1. Activate Adarkar Valkyrie by tapping it, targeting Carrion Feeder
2. Activate Carrion Feeder by sacrificing it
3. When Carrion Feeder dies, Adarkar Valkyrie triggers twice
4. Resolve the first trigger, untapping Adarkar Valkyrie
5. Resolve the second trigger, returning Carrion Feeder from your graveyard to the battlefield
6. Resolve the Carrion Feeder ability
7. Repeat

Results

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