Saffi Eriksdotter + Body Launderer + Phyrexian Altar

Saffi Eriksdotter

Body Launderer

Phyrexian Altar

How it works

1. Activate Saffi by sacrificing it, targeting Body Launderer.
2. When Saffi dies, Body Launderer's first ability triggers, causing it to connive.
3. Activate Phyrexian Altar by sacrificing Body Launderer, adding one mana of any color.
4. When Body Launderer dies, its second ability and Saffi trigger.
5. Resolve the Saffi trigger, returning Body Launderer from your graveyard to the battlefield.
6. Resolve the Body Launderer trigger, returning Saffi from your graveyard to the battlefield.
7. Repeat.