Phyrexian Altar + Faceless Butcher + Angel of Indemnity

Phyrexian Altar

Faceless Butcher

Angel of Indemnity

How it works

1. Cast Faceless Butcher by paying its mana cost.
2. When Faceless Butcher enters, its first ability triggers, exiling Angel of Indemnity.
3. Activate Phyrexian Altar by sacrificing Faceless Butcher.
4. When Faceless Butcher dies, its second ability triggers, returning Angel of Indemnity from exile to the battlefield.
5. When Angel of Indemnity enters, it triggers, returning Faceless Butcher from your graveyard to the battlefield.
6. When Faceless Butcher enters, its first ability triggers, exiling Angel of Indemnity.
7. Repeat from step 3.