Havi, the All-Father + Saffi Eriksdotter + Phyrexian Altar

Havi, the All-Father

Saffi Eriksdotter

Phyrexian Altar

How it works

1. Activate Saffi by sacrificing it, targeting Havi.
2. When Saffi dies, Havi triggers, returning any legendary creature card with mana value 1 or less from your graveyard to the battlefield.
3. Resolve the Saffi ability.
4. Activate Phyrexian Altar by sacrificing Havi, adding one mana of any color.
5. When Havi dies, it and Saffi trigger.
6. Resolve the Havi trigger, returning Saffi from your graveyard to the battlefield.
7. Resolve the Saffi trigger, returning Havi from your graveyard to the battlefield.
8. Repeat.