Ashnod the Uncaring + Cauldron Familiar + Witch's Oven + Clock of Omens

Ashnod the Uncaring

Cauldron Familiar

Witch's Oven

Clock of Omens

How it works

1. Activate Witch's Oven by tapping it and sacrificing Cauldron Familiar.
2. Ashnod triggers, copying Witch's Oven's ability.
3. Resolve both Witch's Oven abilities, creating two Food artifact tokens.
4. Activate Clock of Omens by tapping two Food tokens, untapping Witch's Oven.
5. Activate Cauldron Familiar by sacrificing a Food, returning Cauldron Familiar from your graveyard to the battlefield.
6. When Caludron Familiar enters the battlefield, it triggers, causing each opponent to lose 1 life and you to gain 1 life.
7. Repeat.