Basri's Lieutenant, Metallic Mimic, and Altar of Dementia

Prerequisites

• Basri's Lieutenant on the battlefield
• Metallic Mimic on the battlefield
• Altar of Dementia on the battlefield
• You control at least one additional creature that has a +1/+1 counter on it
• "Knight" chosen with Metallic Mimic

Steps

1. Activate Altar of Dementia by sacrificing another creature with a +1/+1 counter on it
2. When the creature dies, Basri's Lieutenant's second ability triggers, creating a 2/2 Knight creature token that enters the battlefield with a +1/+1 counter due to Metallic Mimic
3. Resolve the Altar of Dementia ability, causing target player to mill cards equal to the sacrificed creature's power
4. Repeat

Results

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