Teshar, Ancestor's Apostle, Altar of Dementia, and Dream Stalker

Prerequisites

• Teshar, Ancestor's Apostle on the battlefield
• Altar of Dementia on the battlefield
• Dream Stalker in the graveyard

Steps

1. Cast an artifact in your hand by paying
2. Teshar triggers, returning Dream Stalker from your graveyard to the battlefield
3. When Dream Stalker enters, it triggers, returning another artifact that can be cast for from the battlefield to your hand
4. Resolve the artifact spell cast in step 1
5. Activate Altar of Dementia by sacrificing Dream Stalker Repeat

Results

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