Cass, Hand of Vengeance, Griffin Guide, and Hammerhead, Maggia Boss

Prerequisites

• Cass, Hand of Vengeance on the battlefield
• Griffin Guide on the battlefield
• Hammerhead, Maggia Boss on the battlefield

Steps

1. Activate Hammerhead 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 another creature you control
5. Resolve the Hammerhead ability Repeat

Results

• Infinite +1/+1 counters on a creature
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers