Stalwart Successor, Altar of Dementia, and Gravelgill Axeshark

Prerequisites

• Stalwart Successor on the battlefield
• Altar of Dementia on the battlefield
• Gravelgill Axeshark on the battlefield

Steps

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

Results

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