Color Identity: B

Initial Card State
- Activated Sleeper in your graveyard.
- Cavalier of Night and Carrion Feeder on the battlefield.
Steps
- Activate Carrion Feeder by sacrificing Cavalier of Night.
- When Cavalier of Night dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Cavalier of Night.
- When Activated Sleeper enters the battlefield, it triggers; choose not to sacrifice a creature.
- Activate Carrion Feeder by sacrificing Activated Sleeper.
- When Activated Sleeper dies, it triggers, returning Activated Sleeper from your graveyard to the battlefield as a copy of Cavalier of Night.
- When Activated Sleeper enters the battlefield, it triggers; choose not to sacrifice a creature.
- Resolve the Carrion Feeder ability from step 4, putting a +1/+1 counter on it.
- Repeat from step 4.
Results
- Infinite +1/+1 counters on a creature.
- Infinite death triggers.
- Infinite ETB.
- Infinite LTB.
- Infinite sacrifice triggers.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).