Eloise, Nephalia Sleuth + Cauldron Familiar + Peregrin Took + Yahenni, Undying Partisan

Eloise, Nephalia Sleuth

Cauldron Familiar

Peregrin Took

Yahenni, Undying Partisan

How it works

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