Baba Lysaga, Night Witch + Dross Scorpion + Thran Vigil + Cauldron of Souls + Encroaching Mycosynth

Baba Lysaga, Night Witch

Dross Scorpion

Thran Vigil

Cauldron of Souls

Encroaching Mycosynth

How it works

1. Activate Cauldron of Souls by tapping it, giving the additional creatures persist until end of turn.
2. Activate Baba Lysaga by tapping it and sacrificing the two additional creatures.
3. When the creatures die, Dross Scorpion triggers twice and the creatures' persist abilities each trigger.
4. Resolve the Dross Scorpion triggers, untapping Baba Lysaga and Cauldron of Souls.
5. Resolve the first persist creature, returning one of the creatures from your graveyard to the battlefield with a -1/-1 counter on it.
6. When the creature enters, Thran Vigil triggers, putting a +1/+1 counter on the creature.
7. Repeat from step 5 for the remaining persist trigger.
8. Resolve the Baba Lysaga ability from step 2, causing you to gain 3 life, each opponent to lose 3 life, and you to draw three cards.
9. Repeat.