All 7 Combos with Psionic Sliver

Shelob, Child of Ungoliant + Cauldron Familiar + Maskwood Nexus + Psionic Sliver + Concordant Crossroads

Infinite Damage: Infinite damage, Infinite death triggers, Infinite ETB, Infinite lifegain, Infinite lifegain triggers, Infinite lifeloss, Infinite LTB, Infinite sacrifice triggers

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