Cavalier of Night, Activated Sleeper, and Carrion Feeder

Prerequisites

• Cavalier of Night on the battlefield
• Activated Sleeper in the graveyard
• Carrion Feeder on the battlefield

Steps

1. Activate Carrion Feeder by sacrificing Cavalier of Night
2. When Cavalier of Night dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Cavalier of Night
3. When Activated Sleeper enters the battlefield, it triggers; choose not to sacrifice a creature
4. Activate Carrion Feeder by sacrificing Activated Sleeper
5. When Activated Sleeper dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Cavalier of Night
6. When Activated Sleeper enters the battlefield, it triggers; choose not to sacrifice a creature
7. Resolve the Carrion Feeder ability from step 4, putting a +1/+1 counter on it
8. Repeat from step 4

Results

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