Atla Palani, Nest Tender, Triumph of Saint Katherine, Maskwood Nexus, and Altar of Dementia

Prerequisites

• Atla Palani, Nest Tender on the battlefield
• Triumph of Saint Katherine on the battlefield
• Maskwood Nexus on the battlefield
• Altar of Dementia on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing Triumph of Saint Katherine
2. Triumph of Saint Katherine dies, triggering itself and Atla Palani
3. Resolve the Triumph of Saint Katherine trigger, exiling it and the top six cards of your library into a face-down pile, then shuffling that pile and putting it on top of your library
4. Resolve the Atla Palani trigger, revealing cards from the top of your library until you reveal a creature card and putting that card onto the battlefield
5. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to the sacrificed creature's power
6. Activate Altar of Dementia by sacrificing that creature
7. Repeat from step 4 until Triumph of Saint Katherine is on the battlefield again
8. Repeat from step 1

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Put all creatures in your library onto the battlefield, then into your graveyard