Koll, the Forgemaster, Deathrender, and Skirk Prospector

Prerequisites

• Koll, the Forgemaster on the battlefield
• Deathrender on the battlefield
• Skirk Prospector on the battlefield

Steps

1. Activate Skirk Prospector by sacrificing it, adding
2. When Skirk Prospector dies, Koll and Deathrender trigger
3. Resolve the Koll trigger, returning Skirk Prospector from your graveyard to your hand
4. Resolve the Deathrender trigger, putting Skirk Prospector from your hand onto the battlefield and attaching Deathrender to it
5. Repeat

Results

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