Academy Researchers, Fool's Demise, and Umbral Collar Zealot

Prerequisites

• Academy Researchers on the battlefield
• Fool's Demise on the battlefield
• Umbral Collar Zealot on the battlefield

Steps

1. Activate Umbral Collar Zealot by sacrificing Academy Researchers When Academy Researchers dies, Fool's Demise first and second abilities trigger
2. Resolve the second Fool's Demise trigger, returning it from your graveyard to your hand
3. Resolve the first Fool's Demise trigger, returning Academy Researchers from your graveyard to the battlefield
4. When Academy Researchers enters, it triggers, putting Fool's Demise onto the battlefield from your hand attached to Academy Researchers
5. Resolve the Umbral Collar Zealot ability
6. Repeat

Results

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