Basri's Lieutenant + Renata, Called to the Hunt + Altar of Dementia

Basri's Lieutenant

Renata, Called to the Hunt

Altar of Dementia

How it works

1. Activate Altar of Dementia by sacrificing a creature with at least one +1/+1 counter.
2. Basri's Lieutenant trigger, creating a 2/2 Knight token.
3. When Knight token enters the battlefield, Renata trigger, putting a +1/+1 counter on Knight token.
4. Resolve the Altar of Dementia ability, causing target player to mill cards equal to the sacrificed creature's power.
5. Repeat.