Altar of Dementia, Lesser Masticore, and Sigil Captain

Prerequisites

• Altar of Dementia on the battlefield
• Lesser Masticore on the battlefield
• Sigil Captain on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing Lesser Masticore When Lesser Masticore dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
2. When Lesser Masticore enters, Sigil Captain triggers, putting a +1/+1 counter on Lesser Masticore Resolve the Altar of Dementia ability
3. Repeat

Results

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