Ygra, Eater of All + Cauldron Familiar + Nether Traitor + Phyrexian Altar

Ygra, Eater of All

Cauldron Familiar

Nether Traitor

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing Cauldron Familiar, adding .
2. When Cauldron Familiar dies, Ygra and Nether Traitor trigger.
3. Resolve the Ygra trigger, putting two +1/+1 counters on it.
4. Resolve the Nether Traitor trigger, causing you to pay to return it from your graveyard to the battlefield.
5. Activate Cauldron Familiar by sacrificing Nether Traitor.
6. Ygra triggers, putting two +1/+1 counters on it.
7. Resolve the Cauldron Familiar ability, returning it from your graveyard to the battlefield.
8. When Cauldron Familiar enters the battlefield, it triggers, causing you to gain 1 life and each opponent to lose 1 life.
9. Repeat.