Jackdaw Savior, Loyal Retainers, and Hammerhead, Maggia Boss

Prerequisites

• Jackdaw Savior on the battlefield
• Loyal Retainers in the graveyard
• Hammerhead, Maggia Boss on the battlefield

Steps

1. During your precombat main phase, activate Hammerhead by sacrificing the legendary creature with flying
2. When the creature dies, Jackdaw Savior triggers, returning Loyal Retainers from your graveyard to the battlefield
3. Resolve the Hammerhead ability, putting a +1/+1 counter on it
4. Activate Loyal Retainers by sacrificing it, returning the legendary creature with flying from your graveyard to the battlefield
5. Repeat

Results

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