Basri's Lieutenant, Odric's Outrider, and Altar of Dementia

Prerequisites

• Basri's Lieutenant on the battlefield
• Odric's Outrider on the battlefield
• Altar of Dementia on the battlefield
• You control at least two additional creatures, at least one of which has a +1/+1 counter on it

Steps

1. Activate Altar of Dementia by sacrificing a creature with a +1/+1 counter on it
2. The creature dies, triggering Basri's Lieutenant and Odric's Outrider
3. Resolve the Basri's Lieutenant trigger, creating a 2/2 Knight creature token
4. Resolve the Odric's Outrider trigger, putting a +1/+1 counter on another creature you control
5. Resolve the Altar of Dementia ability from step 1, causing target player to mill cards equal to the sacrificed creature's power
6. Repeat

Results

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