Altar of Dementia, Lesser Masticore, and Hardened Academic

Prerequisites

• Altar of Dementia on the battlefield
• Lesser Masticore on the battlefield
• Hardened Academic on the battlefield

Steps

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

Results

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