Eloise, Nephalia Sleuth + Cauldron Familiar + Peregrin Took + Phyrexian Altar

Eloise, Nephalia Sleuth

Cauldron Familiar

Peregrin Took

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing Cauldron Familiar, adding one mana of any color.
2. When Cauldron Familiar dies, Eloise's first ability triggers, creating a Clue and Food token.
3. Activate Cauldron Familiar by sacrificing a Food.
4. Eloise's second ability triggers, causing you to surveil 1.
5. Resolve the Cauldron Familiar ability, returning it from your graveyard to the battlefield.
6. When Cauldron Familiar enters the battlefield, it triggers, causing each opponent to lose 1 life and you to gain 1 life.
7. Repeat.