Grenzo, Dungeon Warden, Ashnod's Altar, and Arashin Sovereign

Prerequisites

• Grenzo, Dungeon Warden on the battlefield
• Ashnod's Altar on the battlefield
• Arashin Sovereign on the battlefield

Steps

1. Activate Ashnod's Altar by sacrificing Arashin Sovereign, adding
2. When Arashin Sovereign dies, it triggers, causing you to put it on the bottom of your library from your graveyard
3. Activate Grenzo by paying , putting Arashin Sovereign into your graveyard from the bottom of your library, and then putting it onto the battlefield
4. Repeat

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite creature sacrifice triggers