Cavalier of Night, Activated Sleeper, and Bloodflow Connoisseur

Prerequisites

• Cavalier of Night on the battlefield
• Activated Sleeper in the graveyard
• Bloodflow Connoisseur on the battlefield

Steps

1. Activate Bloodflow Connoisseur 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, its first triggered ability from Cavalier of Night triggers; choose not to sacrifice a creature
4. Resolve the Bloodflow Connoisseur ability from step 1
5. Activate Bloodflow Connoisseur by sacrificing Activated Sleeper
6. When Activated Sleeper dies, its last ability from Cavalier of Night triggers, returning itself from your graveyard to the battlefield as a copy of Cavalier of Night
7. When Activated Sleeper enters the battlefield, it triggers; choose not to sacrifice a creature
8. Resolve the Bloodflow Connoisseur ability from step 5
9. Repeat from step 5

Results

• Infinite +1/+1 counters on Bloodflow Connoisseur
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers