Basri's Lieutenant, Serra Redeemer, and Altar of Dementia

Prerequisites

• Basri's Lieutenant on the battlefield
• Serra Redeemer on the battlefield
• Altar of Dementia on the battlefield
• You control at least one additional creature with a +1/+1 counter on it

Steps

1. Activate Altar of Dementia by sacrificing another creature with a +1/+1 counter on it
2. The creature dies, triggering Basri's Lieutenant's second ability, creating a 2/2 Knight creature token
3. When the Knight enters the battlefield, Serra Redeemer triggers, putting two +1/+1 counters on the Knight
4. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to the sacrificed creature's power
5. Repeat

Results

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