Yarus, Roar of the Old Gods, Master of the Veil, and Bloodflow Connoisseur

Prerequisites

• Yarus, Roar of the Old Gods on the battlefield
• Master of the Veil on the battlefield
• Bloodflow Connoisseur on the battlefield

Steps

1. Activate Bloodflow Connoisseur by sacrificing Master of the Veil
2. When Master of the Veil dies, Yarus' second ability triggers, returning Master of the Veil from your graveyard to the battlefield face down, then turning it face up
3. Master of the Veil triggers, turning itself face down
4. Resolve the Bloodflow Connoisseur ability, putting a +1/+1 counter on it
5. Repeat

Results

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