Saffi Eriksdotter + Sister Hospitaller + Phyrexian Altar

Saffi Eriksdotter

Sister Hospitaller

Phyrexian Altar

How it works

1. Activate Saffi by sacrificing it, targeting Sister Hospitaller
2. Activate Phyrexian Altar by sacrificing Sister Hospitaller
3. When Sister Hospitaller dies, Saffi triggers, returning Sister Hospitaller from your graveyard to the battlefield.
4. When Sister Hospitaller enters, it triggers, returning Saffi from your graveyard to the battlefield and causing you to gain 2 life.
5. Repeat.