Shelob, Child of Ungoliant + Cauldron Familiar + Maskwood Nexus + Psionic Sliver + Lightning Greaves

Shelob, Child of Ungoliant

Cauldron Familiar

Maskwood Nexus

Psionic Sliver

Lightning Greaves

How it works

1. Activate Lightning Greaves' equip ability by paying 0, attaching it to Cauldron Familiar.
2. Activate Cauldron Familiar by tapping it, dealing 2 damage to any target and three damage to itself.
3. Cauldron Familiar dies as a state-based action due to having zero or less toughness.
4. Shelob triggers, creating a token copy of Cauldron Familiar that is a Food artifact.
5. Activate the nontoken Cauldron Familiar by sacrificing the Cauldron Familiar token, returning the nontoken Cauldron Familiar from your graveyard to the battlefield.
6. When Cauldron Familiar enters the battlefield, it triggers, causing each opponent to lose 1 life and you to gain one life.
7. Repeat.