Unstoppable Slasher, Solemnity, and Altar of Dementia

Prerequisites

• Unstoppable Slasher on the battlefield
• Solemnity on the battlefield
• Altar of Dementia on the battlefield
• Unstoppable Slasher does not have a counter on it

Steps

1. Activate Altar of Dementia by sacrificing Unstoppable Slasher
2. When Unstoppable Slasher dies, its second ability triggers, returning it from your graveyard to the battlefield with zero stun counters due to Solemnity
3. Resolve the Altar of Dementia ability, causing target player to mill cards equal to Unstoppable Slasher's power
4. Repeat

Results

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