Melira, Sylvok Outcast, Altar of Dementia, and River Kelpie

Prerequisites

• Melira, Sylvok Outcast on the battlefield
• Altar of Dementia on the battlefield
• River Kelpie on the battlefield

Steps

1. Activate Altar of Dementia by sacrificing River Kelpie
2. When River Kelpie dies, its persist ability triggers, returning it from your graveyard to the battlefield without a -1/-1 counter on it due to Melira
3. When River Kelpie enters, it triggers, causing you to draw a card Resolve the Altar of Dementia ability
4. Repeat

Results

• Infinite mill
• Infinite card draw
• Infinite draw triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite death triggers
• Near-infinite mill
• Near-infinite sacrifice triggers