Activate Embalmer's Tools by tapping a Zombie, causing you to mill a card.
Activate Titans' Nest by exiling a card from your graveyard, adding {C} that can only be spent to cast colored spells without {X} in their cost.
Teval's second ability triggers, creating a 2/2 Zombie Druid creature token.
Repeat.

Near-infinite ETB

Near-infinite tapped creature tokens

Exile your library and graveyard

Teval, the Balanced Scale

Titans' Nest

Embalmer's Tools

Activate Titan's Nest by exiling a card from your graveyard, adding {C} that can only be spent to cast a colored spell that does not have {X} in its mana cost.
Repeat step 1 until you have an empty library.
Cast Inverter of Truth by paying {2}{B}{B}.
When Inverter of Truth enters the battlefield, it triggers, exiling your library.
Cast Thassa's Oracle by paying {U}{U}.
When Thassa's Oracle enters the battlefield, it triggers, causing you to win the game.

Win the game

Inverter of Truth

Thassa's Oracle

Sacrifice Eternal Scourge to Ashnod's Altar adding {C}{C}.
Activate Titans' Nest, exiling Eternal Scourge from your graveyard.
Cast Eternal Scourge using the 3 mana produced.
Repeat for infinite ETB, LTB, and storm.

Combos with "Titans' Nest"