Vesperlark, Activated Sleeper, and Carrion Feeder

Prerequisites

• Vesperlark on the battlefield
• Activated Sleeper in the graveyard
• Carrion Feeder on the battlefield

Steps

1. Activate Carrion Feeder by sacrificing Vesperlark
2. When Vesperlark dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Vesperlark
3. Activate Carrion Feeder by sacrificing Activated Sleeper
4. When Activated Sleeper dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Vesperlark
5. Resolve the Carrion Feeder ability, putting a +1/+1 counter on it
6. Repeat from step 3

Results

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