Cass, Hand of Vengeance, Griffin Guide, and Bloodflow Connoisseur

Prerequisites

• Cass, Hand of Vengeance on the battlefield
• Griffin Guide on the battlefield
• Bloodflow Connoisseur on the battlefield

Steps

1. Activate Bloodflow Connoisseur by sacrificing the creature with Griffin Guide attached
2. When the creature dies, Cass and Griffin Guide trigger
3. Resolve the Griffin Guide trigger, creating a 2/2 Griffin creature token
4. Resolve the Cass trigger, returning Griffin Guide from your graveyard to the battlefield attached to the Griffin token
5. Resolve the Bloodflow Connoisseur ability, putting a +1/+1 counter on it
6. Repeat

Results

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