Sigil of the New Dawn, Deathrender, Altar of Dementia, and Cloud of Faeries

Prerequisites

• Sigil of the New Dawn on the battlefield
• Deathrender on the battlefield
• Altar of Dementia on the battlefield
• Cloud of Faeries on the battlefield
• Deathrender attached to Cloud of Faeries
• You control lands that produce at least
• available

Steps

1. Activate Altar of Dementia by sacrificing Cloud of Faeries
2. Sigil of the New Dawn and Deathrender trigger
3. Resolve Sigil of the New Dawn's trigger, paying to return Cloud of Faeries from your graveyard to your hand
4. Resolve Deathrender's trigger, putting Cloud of Faeries from your hand onto the battlefield and attaching Deathrender to it
5. Cloud of Faeries enters the battlefield, triggering itself, untapping two lands you control that can produce
6. Resolve the Altar of Dementia ability from step 1, causing target player to mill three cards
7. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill