Bhaal, Lord of Murder + Phyrexian Altar

Bhaal, Lord of Murder

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing a persist creature that does not have a -1/-1 counter on it.
2. When the creature dies, its persist ability and Bhaal trigger.
3. Resolve the Bhaal trigger, putting a +1/+1 counter on the remaining persist creature.
4. Resolve the sacrificed creature's persist trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
5. Repeat.