Cayth, Famed Mechanist, and Bloodflow Connoisseur

Prerequisites

• Cayth, Famed Mechanist on the battlefield
• Bloodflow Connoisseur on the battlefield
• The persist creature does not have a -1/-1 counter on it

Steps

1. Activate Bloodflow Connoisseur by sacrificing the persist creature
2. When the persist creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
3. When the persist creature enters the battlefield, its fabricate ability triggers, putting a +1/+1 counter on it
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