Sidisi, Regent of the Mire, Karmic Guide, Sparring Mummy, and Hammerhead, Maggia Boss

Prerequisites

• Sidisi, Regent of the Mire on the battlefield
• Karmic Guide in the graveyard
• Sparring Mummy on the battlefield
• Hammerhead, Maggia Boss on the battlefield

Steps

1. Activate Sidisi by tapping it and sacrificing Sparring Mummy, returning Karmic Guide from your graveyard to the battlefield
2. When Karmic Guide enters the battlefield, it triggers, returning Sparring Mummy from your graveyard to the battlefield
3. When Sparring Mummy enters the battlefield, it triggers, untapping Sidisi
4. Activate Hammerhead by sacrificing Karmic Guide
5. Repeat

Results

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