Requires

Worldfire must be in hand. Kaya the Inexorable must be on the battlefield. Cauldron Familiar must be on the battlefield. Mana needed:

Steps

1. Activate Kaya's first loyalty ability, putting a ghostform counter on Cauldron Familiar.
2. Cast Worldfire, exiling all permanents, all cards in all hands and graveyards, and setting each player's life total to one.
3. Cauldron Familiar triggers, returning itself from exile to your hand and creating a 1/1 Spirit creature token.
4. Cast Cauldron Familiar.
5. Cauldron Familiar enters the battlefield, losing each opponent 1 life and you to gain 1 life.

Results